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A 17.5 mL portion of a 0.1050 M Na2CO3 solution is added to 46.0 mL of 0.1250 M NaCl. What is the concentration of sodium ion in the final solution?
The sodium ion concentration in the solution of 17.5 mL of 0.1050 M Na₂CO₃ and 46.0 mL of 0.1250 M NaCl is 0.148 M.
To find the Na⁺ concentration in the final solution, we need to find the number of moles of the ion in the Na₂CO₃ and NaCl solutions and the volume of the final solution.
[tex] C_{Na^{+}} = \frac{n_{t}}{V_{t}} [/tex] (1)
Where:
[tex] n_{t} [/tex]: is the total number of moles of Na⁺
[tex] V_{t} [/tex]: is the volume of the final solution
The number of moles of Na⁺ in the Na₂CO₃ solutionThe number of moles of Na₂CO₃ can be calculated as follows:
[tex] n_{Na_{2}CO_{3}} = C_{Na_{2}CO_{3}}*V_{Na_{2}CO_{3}} [/tex]
Where:
[tex] C_{Na_{2}CO_{3}} [/tex]: is the concentration = 0.1050 mol/L
[tex] V_{Na_{2}CO_{3}} [/tex]: is the volume = 17.5 mL = 0.0175 L
[tex] n_{Na_{2}CO_{3}} = 0.1050 mol/L*0.0175 L = 1.84 \cdot 10^{-3} \:moles [/tex]
We can find the number of moles of Na⁺ knowing that in 1 mol of Na₂CO₃ we have 2 moles of Na⁺.
[tex] n_{Na^{+}} = \frac{2 \:mol\: Na^{+}}{1\:mol \:Na_{2}CO_{3}}*mol \:Na_{2}CO_{3} = \frac{2 \:mol\: Na^{+}}{1\:mol \:Na_{2}CO_{3}}*1.84 \cdot 10^{-3} \:moles = 3.68 \cdot 10^{-3} \:moles [/tex]
The number of moles of Na⁺ in the NaCl solutionThe number of moles of Na⁺ in the NaCl solution is:
[tex] n_{NaCl} = C_{NaCl}*V_{NaCl} = 0.1250 mol/L*0.046 L = 5.75 \cdot 10^{-3} \:moles [/tex]
In 1 mol of NaCl we have 1 mol of Na⁺, so the number of moles of Na⁺ in the NaCl solution is 5.75x10⁻³ moles.
Total number of moles of Na⁺The total number of moles of Na⁺ in the final solution can be calculated as follows
[tex] n_{t} = n_{{Na^{+}}_{Na_{2}CO_{3}}} + n_{{Na^{+}}_{NaCl}} = 3.68 \cdot 10^{-3} \:moles + 5.75 \cdot 10^{-3} \:moles = 9.43 \cdot 10^{-3} moles [/tex]
Hence, the number of moles of Na⁺ in the final solution is 9.43x10⁻³ moles.
The volume of the final solutionThe volume of the final solution is given by:
[tex] V_{t} = V_{Na_{2}CO_{3}} + V_{NaCl} = 0.0175 L + 0.046 L = 0.0635 L [/tex]
Concentration of Na⁺ in the final solutionThe concentration of Na⁺ in the final solution is (eq 1):
[tex] C_{Na^{+}} = \frac{n_{t}}{V_{t}} = \frac{9.43 \cdot 10^{-3} moles}{0.0635 L} = 0.148 mol/L [/tex]
Therefore, the concentration of sodium ions in the final solution is 0.148 M.
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Buffer #1: 0.15 M HF(aq) and 0.10 M NaF(aq)
Buffer #2: 0.090 M HF(aq) and 0.060 M NaF(aq)
Fill in the following sentence:
The pH values of Buffers #1 and #2 are _______, and the buffering capacity of Buffer #1 is _______ than that of Buffer #2.
a) unequal; higher
b) equal; lower
c) unequal; lower
d) equal; higher
Buffer #1: 0.15 M HF(aq) and 0.10 M NaF(aq) Buffer #2: 0.090 M HF(aq) and 0.060 M NaF(aq). The pH values of Buffers #1 and #2 are equal, and the buffering capacity of Buffer #1 is higher than that of Buffer #2.
A buffer is a solution that is capable of withstanding changes in pH caused by the introduction of acid or base substances. It may neutralize tiny quantities of additional acid or base, allowing the pH of the solution to remain reasonably constant.
For buffer 1;
[HF] = 0.15 M [NaF] = 0.10 MUnder Standard Conditions, Ka(acid dissociation constant) for HF = 3.5 × 10⁻⁴
pKa = -log Ka
pKa = -log (3.5 × 10⁻⁴)
pKa = 3.454
The formula for calculating the buffer value can be represented by:
[tex]\mathbf{pH = pKa + log \dfrac{([A^+])}{([HA])}}[/tex]
[tex]\mathbf{pH = 3.454 + log \Big(\dfrac{0.10}{0.15}}\Big)[/tex]
pH = 3.2779
For Buffer 2;
[HF] = 0.090 M [NaF] = 0.060 M[tex]\mathbf{pH = 3.454 + log \Big(\dfrac{0.06}{0.09}}\Big)[/tex]
pH = 3.2779
We can see that the pH of buffer 1 is equivalent to the pH of buffer 2.
Buffer capacity measures a solution's capacity to endure pH fluctuations by either accepting or detaching H+ and OH- ions.
For Buffer 1:
The buffer capacity can be expressed by using the formula:
[tex]\mathbf{\beta = \dfrac{2.3 \ Ka [H^+] [C]}{(Ka+ [HA])^2}}[/tex]
where;
C = total concentration of buffer components i.e. [HA] + [A⁻][tex]\mathbf{\beta = \dfrac{2.3 \ \times 3.5 \times 10^{-4} \times (0.15) (0.15 \times 2)}{(3.5 \times 10^{-4} + (0.15)^2 }}[/tex]
[tex]\mathbf{\beta = \dfrac{3.6225 \times 10^{-5}}{0.02260}}[/tex]
[tex]\mathbf{\beta = 0.0016}[/tex]
For Buffer 2:
[tex]\mathbf{\beta = \dfrac{2.3 \ \times 3.5 \times 10^{-4} \times (0.09) (0.09 \times 2)}{(3.5 \times 10^{-4} + (0.09)^2 }}[/tex]
[tex]\mathbf{\beta = \dfrac{1.3041 \times 10^{-5}}{0.008163}}[/tex]
[tex]\mathbf{\beta = 0.00159}[/tex]
Therefore, we can conclude that the pH values of Buffers #1 and #2 are equal, and the buffering capacity of Buffer #1 is higher than that of Buffer #2.
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If a steam reforming line processes methane at a temperature of
725.0°C and a pressure of 12.00 atm, what is the volume (in L) that
20.0 moles of methane would occupy in the reactor?
Answer:
ideal gas law. PV=nRT
Explanation:
pressure x volume = #moles x R (constant of 8.31) x temp
WILL GIVE BRAINLIEST AND 20 POINTS!
Calculate the volume in milliliters of a solution required to provide 2.14 g o sodium chloride from a 0.930 M solution.
Answer:
Step 1 of 3
Here we have to calculate the volume of the solution in mL.
(a) 2.14 g of sodium chloride from a 0.270 M solution
We can calculate the volume of a solution from its molarity. It is known that the molarity of a solution can be calculated as follows,
Molarity = 
Hence volume of solution = 
Here it has been given that,
Mass of NaCl = 2.14 g
Molarity = 0.270 M
Molecular weight of NaCl = 58.44 g/mol
In order to calculate the volume, 1st we have to find out the number of moles,
Number of moles of NaCl = 
=  = 0.03662 mol of NaCl
Now the volume can be calculated as,
volume of solution = 
=  = 0.136 L or 136 mL solution
Hence the volume of NaCl is found to be 136 mL.
he specific rate constant, k, for the following first-order
reaction is 9.16 x 10-3
s
-1 at 0.0°C. The activation energy of
this reaction is 88.0 kJ/mol. Determine the value of k at
2.0°C.
N2O5 NO2 + NO3
A comparison of kinetic and potential energy is shown here with the position and motion of a round object with regards to a hill.
Which statements support the claim that an energy transfer is occurring as the ball rolls down the hill? Select ALL that apply.
A) the ball transfers energy to the air in the form of sound
B) the ball generates a gravitational field as it rolls downward
C)the potential energy is converted to kinetic energy as the ball rolls down the hill
D)the kinetic energy is converted to potential energy as the ball rolls down the hill
E) the ball loses kinetic energy but generates thermal energy as it moves down the hill
Answer:
YALL ITS A AND C
Explanation:
The potential energy is converted to kinetic energy as the ball rolls down the hill.
What are potential energy and kinetic energy?
The energy that is conserved or stored in a substance or object is known as potential energy. The position, organization, or state of the object or substance determines the amount of stored energy.
Potential energy mostly comes in two forms: The potential energy of gravity and Potential elastic energy.
The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object to accelerate it. We must put in effort to apply force.
Therefore, The potential energy is converted to kinetic energy as the ball rolls down the hill.
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What characterizes a homogeneous mixture?
A. The mixture settles out when left standing.
B. The substances are evenly distributed throughout.
O C. The mixture has different consistencies.
D. The substances are identifiable in the mixture.
Answer:
D. The substances are evenly distributed throughout.
the following except____are examples of neutral oxides.
a. nitrogen (ii) oxide
b. carbon(ii) oxide
c. water
d. nitrogen (i) oxide.
Answer:
a nitrogen oxide
Explanation:
i think
1.Which evidence did Wegener use to develop the theory of continental drift?
There is no evidence of glaciers anywhere in South America.
The climate of Siberia has always been the same.
Similar fossils were found on different continents.
The Rocky Mountains are taller than the Appalachian Mountains.
2.According to the theory of continental drift, which option indicates the order of how the continents changed positions?
B, C, A
C, B, A
A, B, C
C, A, B
3. The theory of continental drift proposes that the Earth's continents may have once been united as a supercontinent but have drifted apart over time.
What was the name of the supercontinent?
Americas
Gondwanaland
Laurasia
Pangaea
4.Part of Weneger's theory of continental drift was that the original supercontinent broke into two pieces.
What were these two land masses called?
Laurasia and Pangaea
Gondwanaland and Pangaea
Laurasia and Gondwanaland
Pangaea and Eurasia
5.
Over time Pangaea broke apart to form other continents.
Which group of modern-day continents composed Gondwanaland?
North America and South America
North America, Europe, and most of Asia
Africa, South America, Antarctica, Australia, and the subcontinent of India
Antarctica, South America, and Europe
Answer:
1. the second one
2. we need to know what the letters go to like is there a picture?
3. the first one
4.the last one
5.the third one
Explanation:
0.250 moles of NaCl is dissolved in 0.850 L of solution. What is the molar concentration?
Considering the definition of molarity, the molar concentration is 0.294 [tex]\frac{moles}{liter}[/tex].
Molarity reflects the concentration of a solution indicating the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]molarity=\frac{amount of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case, you know:
amount of moles of solute= 0.250 molesvolume= 0.850 LReplacing in the definition of molarity:
[tex]molarity=\frac{0.250 moles}{0.850 L}[/tex]
Solving:
molarity= 0.294 [tex]\frac{moles}{liter}[/tex]
Finally, the molar concentration is 0.294 [tex]\frac{moles}{liter}[/tex].
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How could the AX3 molecular structure (one central atom with three bonded atoms) be non-polar even with bond dipoles present?
options:
1. If there were no lone pairs on the central atom
2. If there were one lone pair on the central atom
3. If there were two lone pairs on the central atom
4. If there were three lone pairs on the central atom
The AX3 molecular structure (one central atom with three bonded atoms) can be non-polar even with bond dipoles present If there were no lone pairs on the central atom. Option 1 is correct.
The molecular structure or shape is a 3-D pattern showing the arrangement of atoms of a molecule.
The molecular structure of AX3 is said to be composed of a central atom connected and bounded to three atoms which are equally spaced at an angle of 120° towards one another. It has a shape of trigonal planar and its sp² hybridized that does not have any lone pair.
The polarity of a molecule or a compound has to do with the presence of lone pair in the central atom. Since AX3 has no lone pair of electrons in its central atom it is said to be non-polar.
Example of compounds that exhibit AX3 with no lone pair is: BF₃ and CO₃²⁻
Therefore, we can conclude that we've understood what is molecular structure and how to identify the molecular structures that are polar and non-polar in nature.
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Cotton and coir are the types of ___________fibres.
Answer:
naturalExplanation:
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mark as brainliest please
Answer:
seed fibers
Explanation:
since they're harvested separately from their seed
What makes physical change a physical change and a chemical change a chemical change
Answer:
A physical change is reversible and the changes made are only physical (smell, physical state, volume, etc) and most importantly no new substance is formed. In a chemical change, a new substance is formed, the chemical properties are changed, and it's permanent.
which ionic equation represents the reaction taking place at anode during the electrolysis of molten aluminium oxide?
Explanation:
at the Anode, Oxide ions lose electrons and produce Oxygen gas
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Who is most likely associated with the quote below?
“Nothing exists except atoms and empty space; everything else is opinion."
А: Democritus
B: Aristotle
C: Thales
D: Epicurus
Answer:
democritus
Explanation:
i looked it up
The volume between the 50.00 mark and the valve of a buret is 5.58 . The buret reading of an upside down buret containing a pocket of hydrogen gas is 31.15 mL. What is the total volume of hydrogen in the buret?
We have that for the Question ,it can be said that The total volume of hydrogen gas is
Vt=24.43ml
From the question we are told
The volume between the 50.00 mark and the valve of a buret is 5.58 . The buret reading of an upside down buret containing a pocket of hydrogen gas is 31.15 mL. What is the total volume of hydrogen in the buret?
Generally
With the buret divided into three
The value section the middle and the top
With hydrogen gas contained in the middle and value area
We have
Volume of middle
Vm=(50-31.15)
Vm=18.85ml
For Valve area
Vv=5.58ml
Therefore
The total volume of hydrogen gas is
Vt=Vm+Vv
Vt=18.85+5.58
Vt=24.43ml
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please help!!!!!!!!!
Answer
At the crust
Explanation:
Mantle is far away from it unless its in a ocean.
Answer:
A mountain would form on the continental crust
Explanation:
Typically, a convergent plate boundary—such as the one between the Indian Plate and the Eurasian Plate—forms towering mountain ranges, like the Himalaya, as Earth’s crust is crumpled and pushed upward.
Question 25 of 30
Which statement best describes what happens when thermal energy of the
air around a fire is transferred to the surrounding air?
O A. The thermal energy is spread out by the surrounding air.
O B. The thermal energy is destroyed as it changes to chemical energy.
C. The thermal energy is destroyed over time.
ОО
D. The thermal energy changes to chemical energy.
SUBMIT
Answer: The thermal energy is spread out by the surrounding air.
Explanation:
got it right on test
Change in oxidation number in zn is
Answer:
Equalize the changes in oxidation number Each Zn atom has lost two electrons, and each H atom has gained one electron. You need 2 atoms of H for every 1 atom of Zn. This gives us total changes of +2 and -2.
Explanation:
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pls make brainliest :P
And have an amazing day <3
How many mass would be contained in 0.01mol of NaOH
Answer:
∴ No. of atoms in 0.01 moles of NaOH = 6.02×10
23
×0.01=6.02×10
21
how has the model of an atom changed overtime?
Answer:
This atomic model has changed over time. Scientists used the model to make predictions. Sometimes the results of their experiments were a surprise and they did not fit with the existing model. Scientists changed the model so that it could explain the new evidence.
Explanation:
Find the sum of coefficients for all reactants and products.
CuBr2 + H3PO4 ⇨ Cu3(PO4)2 + HBr
The sum of coefficients for all reactants and products of given reaction is 12.
[tex]CuBr_{2} + H_{3}PO_{4}[/tex]⇨ [tex]Cu_{3} (PO_{4})_{2} + HBr[/tex]
For finding coefficients each molecules in reactant and product, first we have to balanced the given chemical equation.
What is balanced chemical equation?The chemical equation in which number of atoms for each elements and total charges is same in both side, reactant as well as product in a reaction.
Example: Let the unbalanced chemical equation is,
[tex]CuBr_{2} + H_{3}PO_{4}[/tex]⇨ [tex]Cu_{3} (PO_{4})_{2} + HBr[/tex]
So, the balanced chemical equation become.
[tex]3CuBr_{2} + 2H_{3}PO_{4}[/tex] ⇨ [tex]Cu_{3} (PO_{4})_{2} +6 HBr[/tex]
Reactant Product
The number placed prior to the each molecules is called coefficient of reactant and product.
So, the total coefficient for reactant and product are 3 + 2 + 1 + 6 = 12.
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How does a Camel prevent the loss of water from their body?
Camels lose less water through their urine and feces than many other mammals. Their kidneys concentrate water heavily, leading to salty urine. The intestines also reabsorb water from intestinal material as it is digested, so dry feces are produced.
If you had excess chlorine, how many moles of aluminum chloride could be produced from 12.0g of aluminum
Answer:
Hence, 0.455 mol of aluminum chloride could be produced from 12.0 grams of aluminum.
Explanation:
Given data:
•Mass of aluminum is 12.0 grams.
To find:
•Number of moles of aluminum chloride produced from Al.
The given reaction is as follows:
2A1+ 3Cl₂ → 2AlCl3
First, we have to find the number of moles of aluminum by the relation given below:
n = m M;
Where:
•n is the number of moles.
•m is the mass in grams.
•M is the molar mass in g/mol.
The molar mass of Al is 26.98 g/mol. Substitute the values in above equation to obtain the number of moles of aluminium as follows:
n = (12.0g)/(26.98g /mol)
= 0.445 mol
From the reaction stoichiometry, we can see that 2 moles of Al forms 2 moles of aluminium chloride (A1C13). This means, the number of moles of Al and AlCl3 is equal.
So, 0.445 mol Al will give 0.455 mol AlC13.
5. The point at which the relative humidity reaches 100% is the
and (2 points)
the air can hold no more water vapor.
The dew point is the temperature the air needs to be cooled to (at constant pressure) in order to achieve a relative humidity (RH) of 100%. At this point the air cannot hold more water in the gas form.
Answer:
ii cud givee uu an explanation for understandment for help if still don't understand im sowwyy thenn.
Explanation:
relative humidity is related to the partial pressure of water vapor in the air at 100% humidity the partial pressure is equal to the vapor pressure and no more water can enter the vapor phase.
Which of the following statements best describes chemical equilibrium?
Answer:
A state in which the concentrations of all the reactants and products remain constant with time
Explanation:
The statement which best describes chemical equilibrium is that the concentrations of all the reactants and products remain constant with time.
What is Equilibrium?This is the situation in an object in which two or more forces or factors counter-influences because of them being constant.
In this scenario, the concentrations of all the reactants and products is constant which depicts the right choice.
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Daje 25pkt bo tylko tyle mam :(( pomoże ktoś?
Answer:
brak syna 25 punto, syn 13
Explanation:
A d6 electron configuration will typically have an overall spin of
Answer: 2
Explanation:
Which of the following must be true in order for a reaction to have no excess reactants?
A) It must be a double-replacement reaction.
B) Reactants must be present in equal amounts.
C) Reactants must be present in the exact molar ratios in the balanced chemical equation.
D) It must occur at a high temperature.
Answer:
C) Reactants must be present in the exact molar ratios in the balanced chemical equations.
Explanation:
need answers pls!! Multiple choice
Answer:
BONJOUR.
CHEMICAL CHANGE ARE THOSE THAT FORM A NEW SUBSTANCE
PHYSICAL CHANGE ARE THOSE THAT DOESN'T FORM A NEW SUBSTANCE.
OPTION D IS THE ANSWER
I HOPE IT IS HELPFUL.
MERCI