The stage in star life cycle in which hydrogen is the primary fuel for nuclear fusion is Main sequence.
The same natural cycles that apply to living things also apply to stars. This cycle starts with birth, develops over the course of a lifespan marked by change and growth, and culminates in death. The life cycle of a star, which lasts for billions of years, is completely different from the life cycle of a living thing.
What is Main sequence stage of the star life cycle ?When the core temperature reaches the necessary level, fusion can start during the main sequence phase of development. The hydrogen protons undergo this transformation into helium atoms. An enormous quantity of energy is released from the core of a main-sequence star as a result of this exothermic reaction, which produces more heat than it consumes.
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how is unreacted t-pentyl alcohol removed in this experiment? look up the solubility of the alcohol and the alkyl halide in water.
t-pentyl alcohol is soluble in water due to hydrogen bonding and goes into aqueous layer and t-pentyl chloride soluble in organic layer and goes into organic layer.
Organic solvents are carbon-based substances capable of dissolving or dispersing one or more other substances. Organic solvents can be carcinogens, reproductive hazards, and neurotoxins. Carcinogenic organic solvents include benzene, carbon tetrachloride, and trichloroethylene.
After completion of reaction we have to add sodium bicarbonate to make pH to neutral (to quench HCl). Then charge organic solvent and water. Then shake the reaction mixture.
t-pentyl alcohol is soluble in water due to hydrogen bonding and goes into aqueous layer and t-pentyl chloride soluble in organic layer and goes into organic layer.
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the mass of water obtained in a combustion analysis of a 1.000 g sample of an organic compound containing carbon, hydrogen, and oxygen is 0.2980 g. what is the mass percent of hydrogen in the compound?
The mass percentage of hydrogen in the compound is 3.335% when a 1000g sample of an organic compound containing carbon, hydrogen and oxygen of 0.2980g.
The mass of water obtained in combustion analysis of a 1.000 g sample of an organic compound containing carbon, hydrogen, and oxygen is 0.2980 g
Mass of sample=1.000g
mass of water= 0.2980 g
Molar mass of water= 18.02 g/mole
No. of moles of H2O = given mass/ molar mass
= 0.2980 / 18.02 gram/ mole
= 0.01653
1 mole of H2O contain 1 mole of H. so, 0.01653 mole of water contains moles of H2O is equals to,
(0.01653 mole H2O) . (2 mole H / 1 mole H2O ) . (1.008gH / 1 mole H)
= 0.033324gH
mass percentage of H in the compound is,
mass% H = (0.033324gH / 1000g) . 100%
= 3.335%
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the elctron is moving from enregy level 2 to energy level 1 (the ground state). what happens during this transition
The energy of the electron will decrease when it transitions from energy level 2 to energy level 1 (the ground state).
It should be clear that for an electron to get stimulated from its ground state, energy must be added to it. Similar to this, as an electron descends to a lower energy level from a higher energy level, it releases energy. We can determine how much energy is received or released during an electron's transition . It goes without saying that a positive energy shift indicates that the electron absorbs energy, whereas a negative energy change suggests that the electron releases energy.
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if the drug were supplied in 100 ml solution with a concentration of 10 mg/ml, at what rate in ml per hour would you infuse the solution for 15 min to obtain an infusion rate of 3.8 g/h?
The drug is in solution form with concentration 10 mg/ml. To obtain an infusion rate of 3.8 g/h it must be given at rate of 380 ml/h
The problem can be solved using unitary method. First, find the value of single unit, then multiply that to get the necessary value.
For example:
price of 10 apples is $5, then
price of 1 apple is $5/10 = $0.5
price of 6 apples = 6 x $0.5 = $3
In the given problem, concentration 10 mg/ml means:
10 mg solute in 1 ml solution, which means
1 mg solute in 1/10 ml solution
3.8 g = 3800 mg solute in 3800 x 1/10 = 380 ml solution
Therefore the infusion rate 3.8 g/h = 380 ml/h
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the molecule has the empirical formula of c3h4o2 the molectular massis 144g/mol the molecular formula for this molecule is
The molecular formula of this molecule is found to be C₆H₈O₄
The empirical formula of the molecule is given to be C₃H₄O₂.
The molar mass of the molecule is given to be 144g/mol.
We know,
n(C₃H₄O₂) = Molecular formula of the molecule.
The value of n can be found as,
n = Molecular mass/Empirical formula mass.
The molar mass of carbon is 12g/mol.
The molar mass of hydrogen is 1g/mlol.
The molar mass of oxygen is 16g/mol.
So, the empirical formula mass of C₃H₄O₂ will be,
= 3 x 12 + 4 x 1 + 2 x 16
= 36 + 4 + 32
= 72 g/mol.
Now, the value of n = 144/72
n = 2.
So, the molecular formula of the molecule is,
= 2(C₃H₄O₂)
= C₆H₈O₄.
The molecular formula of the molecule is C₆H₈O₄.
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which element is oxidized in this reaction? zno+c→zn+co enter the chemical symbol of the element.
Therefore, in ZnO + C Zn + CO, Zinc is reduced and Carbon is oxidised as a result of the loss of electrons (due to gain in electrons). Zinc's oxidation state decreases from +2 to 0, indicating that it is becoming reduced.
The material is referred to be an oxidising agent when it reduces itself and oxidised other substances. The oxidising agent in this case is ZnO. Carbon's oxidation state electrons rises from 0 to +2. ZnO is reduced in the reaction because it reduces CO to Zn by giving up its oxygen. On the other hand, CO is getting oxidised since it is receiving oxygen and generating CO2.
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Balance the following equations.
a. _CH4 + _O2 → _CO2 + _H2O
b. _Zn + _HCl → _ZnCl2 + _H2
c. _H2SO4 + _HI → _H2S + _I2 + _H2O
d. _NaCl + _SO2 + _H2O + _O2 → _Na2SO4 + _HCl
Answer:
a. CH4+202→CO2+2H2O
b.Zn+2HCl→ZnCl2+H2
c.H2SO4+8HI→H2S+4I2+4H2O
d.4NaCl+2SO2+2H2O+O2→2Na2SO4+4HCl
give the structure of the principal organic product formed by the free-radical bromination of methylcyclopentane.
The major organic product formed by the free-radical bromination of methylcyclopentane is 1- Bromo, 1- methyl Cyclopentane .
What is free radicals ?
A specific class of unstable molecule produced throughout typical cell metabolism (chemical changes that take place in a cell). In cells, free radicals can accumulate and harm other molecules like proteins, lipids, and even DNA.
In the presence of sunlight, bromine produces a free radical, which it then absorbs to create the majority of the stable radical. Only the alkane's highest substituted carbon experiences bromination. A tertiary carbon makes an intermediate free radical the most stable. It will therefore be the main product.
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the partial pressure of n2 and o2 in air at sea level (760.0 torr pressure) are 593.5 and 159.2 torr, respectively. what is the mol fraction of o2 in air?
The mole fraction [tex]O_{2}[/tex] in the air is - 0.20.
The mole fraction is defined as the ratio of the number of moles of solute to the number of moles of solute and solvent in a solution.The pressure exerted by an individual gas in a mixture is known as its partial pressure.Dalton's law of partial pressure states that the sum of the partial pressures of the component gases is equal to the total pressure of a mixture of gases.[tex]P_{Total} = P_{gas1} + P_{gas2} + P_{gas3} + .......[/tex]
The total pressure in the air is 760.0 torr.
The partial pressure [tex]O_{2}[/tex] is 159.2 torr.
∴ The mole fraction of [tex]O_{2}[/tex] = [tex]\frac{Partial pressure of O_{2} }{ Total pressure}[/tex]
= [tex]\frac{159.2}{760.0}[/tex]
= 0.20
So, the mole fraction [tex]O_{2}[/tex] in the air is - 0.20.
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Which type of bond will most likely be found in hbr given that the electronegativity of hydrogen is 2.20 and the electronegativity of bromine is 2.96?
The bond in HBr is likely to be a non-polar covalent bond.
The inorganic substance with the formula HBr is hydrogen bromide. It is a hydrogen halide made up of both bromine and hydrogen. It is a colorless gas that, when dissolved in water, produces hydrobromic acid, which, at room temperature, is saturated with 68.85% HBr by weight.
Hydrogen bromide (HBr) is a covalent compound, which means it is formed by the sharing of electrons between the hydrogen and bromine atoms. In a covalent bond, the electrons are shared equally between the atoms, and the bond is typically non-polar. The difference in electronegativity between hydrogen and bromine is 0.76, which is less than the typical threshold of 1.7 for a polar covalent bond. Therefore, the bond in HBr is likely to be a non-polar covalent bond.
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The bond in HBr is likely to be a non-polar covalent bond.
The inorganic substance with the formula HBr is hydrogen bromide. It is a hydrogen halide made up of both bromine and hydrogen. It is a colorless gas that, when dissolved in water, produces hydrobromic acid, which, at room temperature, is saturated with 68.85% HBr by weight.
Hydrogen bromide (HBr) is a covalent compound, which means it is formed by the sharing of electrons between the hydrogen and bromine atoms. In a covalent bond, the electrons are shared equally between the atoms, and the bond is typically non-polar. The difference in electronegativity between hydrogen and bromine is 0.76, which is less than the typical threshold of 1.7 for a polar covalent bond. Therefore, the bond in HBr is likely to be a non-polar covalent bond.
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since the beginning of the industrial revolution, about 340 to 420 petagrams carbon (a petagram or pg is 1015 grams) in the form of co2 has been emitted to the atmosphere. how much of this anthropogenic carbon dioxide has been absorbed by the world's oceans? select one: a. about 1/3 of it b. about 1/4 of it. c. about 1/2 of it. d. none
CO2 produced by humans About 1/3 of carbon dioxide has been absorbed by the oceans. with an atmospheric carbon content of more than 800 billion tons.
What is a carbon's purpose?Metals are melted using coke made from coal and charcoal, two forms of impure carbon. In the iron and steel sectors, it is particularly crucial. Pencil leads, electric motor brushes, and furnace linings all include graphite.
What elements makes up carbon?A carbon atom has a nucleus made up of six protons and six neutrons that is encircled by six electrons. The first two electrons must occupy the inner atomic orbital according to quantum mechanics, while the other four electrons must have wavefunctions that only partially fill the second standard and three second primary orbitals.
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classify these amino acids as acidic, basic, neutral polar, or neutral nonpolar. - acidic: NONE
- basic: lysine
- neutral polar: serine
- neutral nonpolar: phenylalanine, proline, methionine
Answer:
Explanation:
Correct
2NaNO3 + PbO → Pb(NO3)2 + Na₂O What is the mole ratio between lead(II) oxide and lead(II) nitrate? ? mol PbO mol Pb(NO3)2 Fill in the green blank.
Answer: There is a 1:1 mole ratio between these two compounds.
Explanation:To determine the mole ratio between lead(II) oxide (PbO) and lead(II) nitrate (Pb(NO3)2) in the given chemical equation, you will need to balance the equation first. The balanced chemical equation is:
2NaNO3 + PbO → Pb(NO3)2 + Na2O
Once the equation is balanced, you can use the coefficients in front of each compound to determine the mole ratio. In this case, the coefficient for PbO is 1, and the coefficient for Pb(NO3)2 is 1, which means that there is a 1:1 mole ratio between these two compounds. This means that for every 1 mole of PbO, there is 1 mole of Pb(NO3)2 produced in the reaction.
It is important to note that the mole ratio is only a way to express the relative amounts of reactants and products in a chemical reaction, and does not necessarily reflect the actual amounts of the compounds involved. To determine the actual amounts of each compound, you will need to know the mass or volume of the compounds, as well as their respective densities or molar masses.
4. describe how the antibiotic chemical gets from the disk into the agar. name the process and tell how that process works.
The process of which antibiotics get from the disk into the agar is called diffusion. Diffusion is the process of molecules moving from an area of high concentration to an area of lower concentration.
In the case of antibiotic disks on agar, the antibiotic molecules on the disk move outwards and into the surrounding agar. Diffusion works by allowing the molecules to move randomly in all directions until they reach an area of lower concentration. The molecules will continue to move until they reach a state of equilibrium, meaning that the molecules are evenly spread across the agar. This process is known as Brownian Motion.
When the antibiotic molecules diffuse into the agar, they are able to interact with the bacterial cells in the agar. If the antibiotic molecules can bind to molecules on the cell surface of the bacteria, then they can prevent the bacteria from functioning properly. This leads to the death of the bacteria, and the resulting zone of inhibition can be seen as a clear area around the disk.
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a sample of 2.0 moles of hydrogen gas is placed in a container with a volume of 10.4 l. what is the pressure of the gas in torr if the gas is at 25oc?
Pressure of the gas in torr is 3575.77 when 2.0 moles of hydrogen gas are present in a container of 10.4 L at room temperature.
What is pressure in terms of gas ?
The average linear momentum of a gas's moving molecules is then calculated as the gas's pressure. Gases produce pressure, or force per unit of area. In addition to torr, atmosphere, and bar, the pressure of a gas can also be stated in many additional SI units, such as pascal or kilopascal.
Given :
Moles of hydrogen = 2.0 moles
volume of container = 10.4 L
Temperature = 25° C
Using the gas law
PV = nRT
P x 10.4 L = 2.0 moles x 0.0821 atm L/ mol k
P= 4.70 atm
P = 4.70 atm x 760 torr/ atm
P = 3575.77 torr
Thus pressure of the gas in torr is 3575.77 when 2.0 moles of hydrogen gas are present in a container of 10.4 L.
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as the term "peroxide" is used in chapter 10, it can refer to which structure(s)?
The RCOOCR structure can be referred to because the word "peroxide" is mentioned in Chapter 10. Carboxylic acid: A molecule with a carboxyl group (RCOOH; RCO2H).
Because of how easily the carboxyl group gives up a proton, carboxylic acids get their name (pKa usually in the range of 0-5). Structure of carboxylic acids in general. A carbon atom or group or a hydrogen atom is X. The carbonyl group (C=O) and Carboxylic group are what give the carboxyl (COOH) group its name. The acidity of the carboxylic acids is their primary chemical property. The major carrier was found to be carboxylic acids (RCOOH).
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Help please as fast as possible. What is an example of mutualism between three organisms in the forest. thankyou
An example of mutualism is between the ants and the acacia plants in the forest.
What is mutualism?Mutualism can be described as the interaction between two or more species where each species has a net benefit. Mutualism is a general type of ecological interaction. Examples include vascular plants engaged with mycorrhizae in mutualistic interactions, flowering plants pollinated by animals, and corals with zooxanthellae, among many others.
Mutualism can be contrasted with competition, in which each species experiences decreased fitness, and exploitation, in which one species benefits at the expense of the other.
Mutualism can be described as conflated with two other kinds of ecological phenomena which are cooperation and symbiosis. Cooperation can be described as an increase in fitness through within-species interactions, although it has been used to refer to mutualistic interactions.
Symbiosis includes two species living in physical contact over a long period of their existence.
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Which of the following is true concerning a galvanic cell? A) Oxidation occurs at the anode and is where anions move towards B) Oxidation occurs at the cathode and is where anions move towards C) Oxidation occurs at the anode and is where cations move towards D) Oxidation occurs at the cathode and is where cations move towards E) Reduction occurs at the anode and is where anions move towards
True statement of galvanic cell Option E) Reduction occurs at the anode and is where anions move towards.
There are constantly spontaneous oxidation-reduction events in galvanic cells. The electrons always travel from the anode to the cathode in any electrochemical cell.
Voltaic or galvanic cells are electrochemical devices that use spontaneous oxidation-reduction events to generate electricity. There are constantly spontaneous oxidation-reduction events in galvanic cells. The electrons always travel from the anode to the cathode in any electrochemical cell. Additionally, oxidation always occurs at the anode, while reduction always occurs at the cathode. The passage of electrons from the anode to the cathode is driven by the spontaneous nature of the reaction. Recall that reduction is the acquisition of electrons whereas oxidation is the loss of electrons. We always have an excess of electrons at the anode since oxidation takes place there, making it the negative electrode.
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Which of the following are the strongest molecular interactions?
-van der interactions
-ionic bonds
-Covalent bonds
-hydrogen bonds
Answer: Hydrogen Bonds!
Explanation: The strength or type of an intermolecular force can be determined by the electronegativity difference between the atoms. Hydrogen bonds are found within atoms that are highly electronegative. This means the difference is greater. This high difference leads to polarity and a stronger force.
thermodynamically, at a given temperature, an oxide is more stable with respect to metal and oxygen gas at higher partial pressure of oxygen than lower partial pressure of oxygen: true or false? g
It is true that an oxide is thermodynamically more stable with respect to metal and oxygen gas at greater partial pressures of oxygen than at lower partial pressures of oxygen at a given temperature.
When a pure metal is oxidized at a high temperature, one or more oxides may occur. Oxidation is prevented if the partial pressure of oxygen is less than the equilibrium value. On the other hand, that metal will be reduced for an oxygen partial pressure that is lower than the equilibrium value at a specific temperature. The Ellingham diagram is used in metallurgy to forecast the temperature at which a metal, its oxide, and oxygen are at their equilibrium. A metal is oxidized if the atmospheric oxygen partial pressure is higher than the dissociation pressure, and it is reduced to a metal if it is lower than the dissociation pressure.
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consider a solution prepared by adding 2.70 g acetic acid, ch3co2h2 to 122.8 g of water. what is the percent by mass of acetic acid in the solution? do not include any units in your answer. answer should be to 3 sig figures.
The solution prepared by the adding the 2.70 g of acetic acid to the 122.8 g of the water . the percent by mass of the acetic acid in solution is 2.15 %.
given that :
mass of acetic acid = 2.70 g
mass of the water = 122.8 g
the mass of the solution = 2.70 g + 122.8 g
= 125.5 g
the percent by mass of the acetic is given below :
percent by mass =( mass of the acetic acid / mass of solution ) × 100 %
percent by mass = (2.70 / 125.5 ) × 100 %
percent by mass = 2.15 %
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select the intermolecular force that is overcome when hexane is converted from a liquid to a gas.a. ion-dipole forcesb. hydrogen bondingc. london dispersion forced. dipole-dipole forces
The intermolecular force that is overcome when hexane is converted from a liquid to a gas is london dispersion force.
The force that hold molecules is the london dispersion forces. the hexene is the non polar molecule, so, the london dispersion force is predominant force. the london dispersion force are the type of the intermolecular forces which acts between the atoms caused by electrostatic force of the attraction.. the london dispersion is the weak force of attraction. it is temporary force of the attractions.
Thus, the london dispersion intermolecular force in acting ion the the hexane converted from the liquid to the gas.
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the overall efficiency of the formation of retinal from beta-carotene is estimated at approximately what percentage?
The total effectiveness of producing retinal from beta-carotene is thought to be around 50%.
The most significant provitamin A is beta carotene, a precursor to vitamin A (retinol). It splits into two molecules of retinal, one of which undergoes further metabolic processing to provide retinol and retinoic acid. Carotene has three isomers: beta, alpha, and gamma, with beta being the most active. There are two ways that carotenoids can be converted into retinal. In the central cleavage process, -carotene 15,15′-mono-oxygenase catalyzes the cleavage of -carotene to produce one molecule of retinal from other provitamin A carotenoids or two molecules of retinal from -carotene.
complete question:
The overall efficiency of the formation of retinal from beta-carotene is estimated at approximately what percentage?
a. 20% b. 35% c. 50% d. 65%
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What are the products of the following reactions? (A trace amount of acid is present in each case.)A. cyclopentanone + cyclohexylamineB. 3-pentanone + butylamineC. 3-pentanone + cyclohexylamine
Imines are the nitrogen analogues of aldehydes and ketones, containing a C=N bond instead of a C=O bond.
They are formed through the addition of a primary amine to an aldehyde or ketone, kicking out a molecule of water (H2O) in the process.
In this post we show some examples of the synthesis of imines, walk through the mechanism for their formation, provide a few of their reactions and compare their properties to those of aldehydes and ketones.
A primary amine is added nucleophilically to the carbonyl group of an aldehyde or ketone to begin the reversible process of amine production. After that, a proton transfer creates a carbinolamine, a neutral amino alcohol. The carbinolamine oxygen is acid protonated to create a better leaving group, which is then removed as water to create an iminium ion. The ultimate imine product is produced when nitrogen is deprotonated.
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Describe the evidence of a chemical change when burning a piece of paper
Answer: So the burning of paper is considered as a chemical change as the paper after burning changes into ashes and fumes of gases evolve.
Explanation:
a 5ml sample of a nitric acid solution is titrated with 33.5 ml of 0.201 m naoh. what is the molarity of the nitric acid solution
In this case, the molarity of the nitric acid solution is (33.5 mL * 0.201 M) / 5 mL = 0.067 M.
In a titration, a measured volume of a solution with an unknown concentration (the titrant) is added to a known volume of a solution with a known concentration (the analyte) until the reaction is complete, at which point the concentration of the unknown solution can be calculated. In the case of a nitric acid solution, the concentration can be determined by titrating the acid solution with a standard solution of sodium hydroxide (NaOH), which has a known concentration. The volume of NaOH solution required to complete the reaction is used to calculate the concentration of the nitric acid solution using the following formula: Molarity of acid = (Volume of NaOH used * Concentration of NaOH) / (Volume of acid). This method allows for the accurate determination of the concentration of the nitric acid solution.
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As the first five elements in group 14 are considered in order from top to bottom, there are changes in both the.
As the first five elements in group 14 are considered in order from top to bottom, there are changes in both the electronegativity values and atomic radii changes.
The columns of the periodic table that contain elements with the same number of valence electrons are referred to as groups. The atomic size of the elements grows as one moves from top to bottom in the 14th group of the periodic table, while electronegativity drops. All elements will have an equal number of electrons in their initial shell and their outermost shell. Thus, changes in atomic radii and electronegativity levels.
Further, The group 14 elements exhibit the periodic table's broadest variation of the chemical behaviour of any group. In general, the electronegativity falls as we advance down the group. Ionization energies drop as atomic radii rise within the group. Down the group, the metallic characteristics also get stronger.
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Determine the empirical formula of a compound found to contain 76.4% mercury, 5.33% nitrogen, and 18.3% oxygen?
I understand that the ratio of the compound will be 1:1:3 (HgNO3), but do you need to balance the charges or leave it be?
The empirical formula of the compound can be determined using their number of moles. The mole ratio of the elements given is 1: 1: 3. Thus, its formula is HgNO₃.
What is empirical formula?The empirical formula of a compound is the formula derived from the number of moles of each element present in one mole of the compound. The number of moles can be calculated from their mass percents.
The mass percent of Hg is 76.4 %. that is 76.4 g in 100 g of the compound.
atomic mass of Hg = 200 g/mol.
number of moles in 76.4 g = 76.4 /200 = 0.38.
mass of nitrogen = 14 g/mol
number of moles in 5.33 g = 5.33 /14 = 0.38.
mass of oxygen = 16 g/mol.
number of moles in 18.3 g = 18.3 / 16 = 1.14.
Thus, their ratio of Hg, N and O is in 0.38 : 0.38 : 1.14. Convert this whole number ratio by dividing through out by the smallest number 0.38. So we arrive at the molar ratio of 1 : 1: 3.
Now, we don't have to balance anywhere and directly put these numbers into the formula and we get, HgNO₃.
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in a metallic substance, electrons are shared among all of the metal atoms in the sample. how does this explain why metals are more malleable and ductile than ionic and covalent compounds?
Answer:
In a metallic substance, electrons are shared among all of the metal atoms in the sample, forming a "sea" of electrons that surrounds the metal ions. This electron sea is responsible for many of the unique properties of metals, including their high conductivity, malleability, and ductility.
The electron sea in a metallic substance allows the metal ions to slide past one another easily, making it easier to deform the metal without breaking it. In contrast, ionic and covalent compounds are held together by strong chemical bonds, which makes it more difficult to deform these materials without breaking the bonds. This is why metals are generally more malleable and ductile than ionic and covalent compounds.
a chemist dissolves of pure sodium hydroxide in enough water to make up of solution. calculate the ph of the solution. (the temperature of the solution is .)
If a chemist dissolves 707.mg of pure sodium hydroxide in enough water to make up 100.mL of solution, then the pH of the solution will be 13.25.
What is sodium hydroxide?Sodium hydroxide (NaOH) has no odour. It is made of solid white crystals that absorb water from the air. Sodium hydroxide is a caustic substance. Sodium hydroxide can be hazardous to workers who come into contact with it. The level of harm is determined by the amount, duration, and activity. It can cause temporary hair loss as well as burns to the eyes, skin, and inner membranes.
Manufacturers may use sodium hydroxide to make soaps, rayon, paper, explosives, dyes, and petroleum products. Other uses for sodium hydroxide include cotton fabric processing, metal cleaning and processing, oxide coating, electroplating, and electrolytic extraction. It is commonly found in commercial drain and oven cleaners.
M = mass / molar mass × liters of solution
M = 0.707 g / 40.0 g/mol × 0.100 L
M = 0.177 M
NaOH → Na⁺ + OH⁻
Molar ratio of NaOH to OH⁻ is 1:1, Then, [OH⁻] = 0.177 M.
pOH = -log [OH⁻]
pOH = -log 0.177
pOH = 0.752
pH + pOH = 14.00
pH = 14 - pOH = 14.00 - 0.752
pH = 13.25
Therefore, pH level of the solution is 13.25
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A chemist prepares a 100-mL solution by dissolving 707.5 mg of pure sodium carbonate in water. The pH of the solution is 13.25.
What is the solution described?
Any combination of one or more solutes that have been dissolved in a solvent is referred to as the solution. To create a homogenous mixture, one solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.
What is an example of a solution?
Examples of solutions include salt water, rubbing alcohol, and sugar that has been dissolved in water. When salt and water are combined, the salt particles become invisible when seen closely, proving that the mixture is homogeneous.
Briefing:
Step 1: Calculate the molarity of NaOH
M = mass of solute / molar mass of solute × liters of solution
M = 0.707 g / 40.0 g/mol × 0.100 L
M = 0.177 M
Step 2: Write the basic dissociation reaction
NaOH → Na⁺ + OH⁻
The molar ratio of NaOH to OH⁻ is 1:1, Then, [OH⁻] = 0.177 M.
Step 3: Calculate the pOH
pOH = -log [OH⁻]
pOH = -log 0.177
pOH = 0.752
Step 4: Calculate the pH
pH + pOH = 14.00
pH = 14 - pOH = 14.00 - 0.752
pH = 13.25
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