Answer: The atomic mass of an element is not a whole number because it is based on the abundance of each isotope for that element.
Explanation: The atomic mass of an element is not a whole number because it is based on the abundance of each isotope for that element. The atomic mass of an element is a weighted average of the atomic masses of all of its naturally occurring isotopes, taking into account the relative abundance of each isotope. For example, if an element has two isotopes, one with an atomic mass of 10 and the other with an atomic mass of 12, and the isotope with an atomic mass of 12 is more abundant, the atomic mass of the element will be closer to 12 than to 10. This means that the atomic mass of an element is usually not a whole number because it is an average of several different atomic masses.
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7
In double replacement reactions, why will two metals not combine with each other when products are
formed?
A metals form negative ions and like charges attract
B metals form positive ions and like charges do not attract
Cmetals form negative ions and like charges do not attract
D metals form positive ions and like charges attract
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When pieces of two ionic compounds swap places to create two new compounds, the reaction is known as a double replacement (also known as a double displacement, exchange, or metathesis reaction).
What is Double Displacement Reaction?When one reactant is partially replaced by another, the reaction is referred to as a twofold displacement reaction.
The list of double displacement reactions is as follows:
CB + CD + AB = AD
A twofold replacement process replaces the ions in two reactant ionic compounds with the same ions in two new product compounds.
When two reactants transfer cations or anions to create two new products, the reaction is called a double replacement.
Metathesis reactions and double displacement reactions are two other names for double replacement processes.
Examples of double replacement reactions include precipitation, gas production, and neutralization.
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How many grams of CaCl₂ would be required to produce a 3.5 M solution with a volume
of 2.0 L?
calculate the molarity of a sultion prepare by dissolving 78.6 g of kf in enough water to produce 225 ml of solution
Therefore, the solution's needed molarity is:6.01M
Check the table below to understand the computations.
Molarity:
Calculating the concentration of a solute that is present in a certain volume of solution is done using the Molarity (M) or Molar Concentration approach. The unit of measurement for the solute is the mole, whereas the unit of measurement for the solution is the liter. The amount of moles of a solute present in one liter of a solution, or moles per liter of a solution, is consequently defined as molarity, represented by the symbol M.
This is, Molarity=moles/volume
Due to it,
mass KF=78.6 g.
KF moles = mass / molar
=78.6/58.09
=1.353mol
volume = 0.225 L from 225 ml.
Using the aforementioned method, we can now get the necessary molarity as,
Molarity=moles/volume
=1.353/0.225
Molarity=6.01M
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how much energy is required to ionize hygrogen in each of the following states? (a) ground state
The energy needed is the energy that changes. The electron in a hydrogen atom is initially assumed to be in the ground state with n=1. The energy of the electron in its ground state is therefore 13.6 eV.
As a result, 12.75eV of the energy is needed to transfer electrons from the ground state to the third excited state. The 4th and 5th ionisation the energies differ significantly from one another. The fourth electron is attracted to the nucleus atom considerably less strongly than the fifth electron because it is in an inner main shell that is closer to the nucleus.
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when a system is adiabatic, what can be said about the entropy change of the substance in the system
The system goes through a reversible process, but because there is no heat movement, the entropy of the system stays the same. Entropy must rise if the process is irreversible.
In other words, it doesn't go down. Entropy change occurs solely as a result of irreversibilities in the absence of any heat transmission, and its consequence is invariably a rise in entropy. In a process that is only adiabatic, entropy does not remain constant.
In an adiabatic process that is also reversible, entropy doesn't change.
where there is no mass transfer in a close system. Because the process is adiabatic, there is no heat transmission and no entropy change as a result of heat transfer. If the process is likewise reversible, then neither entropy inside the system is generated nor is there any entropy change as a result of entropy formation. Therefore, for an adiabatic process that is also reversible, the entropy change is zero.
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Based on the Lewis/electron dot representation
of the two atoms, predict the ratio of metal
cationic (+) atom to nonmetal anionic (-) atom in
Na
the compound.
•:
A. 2:3
B. 1:3
C. 1:1
D. 1:2
Answer: C
Explanation: One electron of sodium is transferred to iodine.
Answer: C
Explanation:
what would happen if you placed a magnet in a furnace capable to melthing any mineral and turned it to maximum
If you placed a magnet in a furnace capable to melting any mineral and turned it to maximum then magnet will lose its magnetic force.
anything that can produce a magnetic field around itself and draw iron with it is a magnet. Every known element and several compounds had undergone magnetism tests by the end of the 19th century, and it was found that each one of them possessed some magnetic properties. The only three elements that exhibit ferromagnetism are iron, nickel, and cobalt. All ferromagnetic materials exhibit hysteresis, a lag in response to shifting forces brought on by energy losses from internal friction. When B is measured for various values of H and the results are graphically displayed, a loop of the kind shown in the accompanying figure is created. A hysteresis loop is what this loop is called.
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Given that S is the central atom, write a Lewis structure of OSF4 in which the formal charges of all atoms are zero.
There is no official fee. Since all 6 valency electrons were coupled onto six electronegativity from the gas and fluor atoms, there are no lone pair protons on the sulfur atom.
An atom is what?A anion is defined solely by its electrons, which are tiny pieces of substance. An atom is made up of a core nucleus and one or perhaps more negative charged electrons that orbit it. The positively charged, comparatively hefty the protons and neutrons that make up the nucleus may be present.
What element has atoms in it?A component of an element is an atom. The certain component only has one kind of atom per atom. Protons, neutrons, plus electrons, which are particles, make up the remainder of an atom.
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Which element in the periodic table would be the mot likely to gain electron in a chemical bond
The right-hand side of the atomic numbers contains nonmetals, which have relatively high electronegativity values and a propensity to gain electrons.
What is chemical bond explain?Atoms in molecules are held together by chemical bonds. Electrostatic forces between negative-charged electrons and ionized atomic nuclei produce bonds (the positions of which in space are determined by quantum mechanics).
How does a chemical bond develop?A chemical bond is the term used to describe the attraction amongst atomic nuclei. To form bonds, atoms exchange or swap their valence electrons. The valence electrons, which make up an atom's lowest energy level, have the capacity to interact chemically. The most straightforward explanation is that atoms are trying to enter the safest (lowest-energy) state they can.
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Please help the question is on the photo attached
Answer:
296,875,000 mol
Explanation:
1mol of SO2 is 64g
1.9×10⁷ kg ----> 1.9×10¹⁰g
1mol ----> 64g
x -----> 1.9×10¹⁰g
x= 1.9×10¹⁰/64 mols
= 296,875,000 mol
Which of these statements is true?
A. The largest muscles of the human body are located in the
arms.
B. Bending of arms is controlled by muscles only.
C. The muscles located in the arm have a fixed shape.
D. Bending of arms involves the contraction and relaxation of a pair of muscles.
Answer:
Explanation:
Correct option is (D).
When human body bend at the elbow , then there is contraction of biceps.
After this there is relaxation of biceps and on other hand the triceps contracts so that elbow is straightened.
The statement that is true is bending of arms involves the contraction and relaxation of a pair of muscles. The correct option is D.
What is a contraction of muscles?The process of shortening the sarcomere and, consequently, the whole myocyte during muscle contraction involves the sliding of the thin filaments through the thick filaments.
The tendon transfers the ensuing longitudinal tension from the extracellular matrix (ECM) to the bone. An Action Potential that travels from the nerves to the muscles causes a muscle contraction. The neurological system sends a signal, which triggers the onset of muscle contraction.
The biceps contract whenever the human body bends at the elbow. Following this, the triceps contract while the biceps relax, causing the elbow to straighten.
Therefore, the correct option is D. Bending of arms involves the contraction and relaxation of a pair of muscles.
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1) an acid base titration involves a a) composition reation b) neutralization reaction c) single-replacement reaction d) decomposition reaction
An acid-base titration involves a neutralization reaction
An acid-base titration is a laboratory technique that is used to determine the concentration of an acid or a base in a solution. The basic principle behind this technique is the fact that acid-base reactions are reversible, meaning that an acid and a base can react with each other to form a neutral compound.
In an acid-base titration, a known concentration of a base is added to a solution containing an unknown concentration of an acid. The acid and the base react with each other to form a neutral compound, such as water. By carefully measuring the volume of the titrant that is required to neutralize the acid, the concentration of the acid in the solution can be determined. This process is known as a neutralization reaction.
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How is Bernoullis principle related to flight
When an aircraft is in flight, the shape of the wings is such that the air travels faster over the top of the wing than it does under the wing. According to Bernoulli's principle, the faster-moving air has a lower pressure than the slower-moving air. This difference in pressure creates an upward force on the wing, known as lift, which counteracts the force of gravity and allows the aircraft to ascend.
In addition to lift, Bernoulli's principle also plays a role in the generation of thrust in aircraft. The movement of air over the blades of a jet engine's fan creates a difference in pressure, with the air having a higher pressure in front of the blades and a lower pressure behind them. This difference in pressure results in a forward force on the blades, which contributes to the overall thrust of the engine.
atoms with a strong attraction for electrons they share with another atom exhibit¬__
Atoms with a strong attraction for electrons they share with another atom exhibit high electronegativity.
What is electronegativity?
The tendency of an atom of a certain chemical element to attract shared electrons (or electron density) when forming a chemical bond is known as electronegativity. The atomic number of an atom and the distance of its valence electrons from the charged nucleus both have an effect on how electronegative that atom is.
An atom or substituent group will attract electrons more when the corresponding electronegativity is stronger. In order to define a bond along the continuous scale from covalent to ionic bonding, electronegativity provides a simple method for quantitatively measuring the bond energy as well as the orientation and strength of a bond's chemical polarity.
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how/why is the 1-child family one potential solution to the increasing problem of global warming due to co2 emissions?
It would be the most high-impact action towards emissions savings.
What is global warming?
As a result of rising levels of greenhouse gases, a phenomena known as global warming occurs when the planet's average temperature rises. As the sun's radiation enters the atmosphere, greenhouse gases like carbon dioxide, methane, and ozone trap it.
What is emissions?
As atoms return to their lower energy states, they emit a variety of coloured photons. When heated or stimulated at high energies, atoms produce light.
why is the 1-child family one potential solution to the increasing problem of global warming due to co2 emissions, because it would be the most high-impact action towards emissions savings.
Therefore, it would be the most high-impact action towards emissions savings.
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The mass of an irregular object is 42.67 g. If it displaces a volume of water equivalent to 12.9 mL, what is the density?
The density of the irregular object, given that it has a mass 42.67 g and it displaces a volume of water equivalent to 12.9 mL is 3.31 g/mL
How do I determine the density?We know that the density of a substance is defined as mass per unit volume as shown below:
Density = mass / volume
With the above formula, we can obtain the density of the irregular object as illustrated below:
Mass of irregular object = 42.67 gVolume of water displaced = 12.9Volume of irregular object = Volume of water displaced = 12.9 mL Density of irregular object = ?Density = mass / volume
Density of irregular object = 42.67 / 12.9
Density of irregular object = 3.31 g/mL
Thus, from the above calculation, the density of the irregular object is 3.31 g/mL
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Where are most volcanoes located? (Use information from the map.) What is happening to the earth’s crust in these locations? Why might these locations be more conducive to volcanic activity?
Answer:
The Pacific ocean
Explanation:
Why because it Causes by the amount of movement of tectonic plates in the area.
When a nucleus of 235U undergoes fission, it breaks into two smaller, more tightly bound fragments. Calculate the binding energy per nucleon for 235U and for the fission product 137Cs
When a nucleus of 235U undergoes fission, it breaks into two smaller, more tightly bound fragments. The binding energy per nucleon for 235U is 7.59 MeV/nucleon and for the fission product 137Cs is 8.39 MeV/nucleon.
What is nucleons ?
Nucleons is a term in chemistry that is used designate both protons and nucleus. The atomic nucleus holds them with a very strong force.
1) m_proton + m_netron + m_electron - m_U
= 92*1.007276466812 + 92*5.4857990943e-4 + 143*1.008664916 - (235.0439299)
= 1.9151 u
= 931.494061 * 1.9151 MeV
= 1784 MeV
=> 1784/235 = 7.59 MeV/nucleon
2) m_proton + m_netron + m_electron - m_Cs
= 55*1.007276466812 + 55*5.4857990943e-4 + 82*1.008664916 - (136.9070895)
= 1.2338 u
= 931.494061 * 1.2338 MeV
= 1149 MeV
=> 1145/137 = 8.39 MeV/nucleon
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Which option describes something that causes ionic bonds to form?(1 point)
A.large electronegativity differences
B.small electronegativity differences
C.combustion reactions
D.replacement reactions
the most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.
It is true that the most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.
The most widely used type of regenerated fibre is rayon, which is mostly derived from plants and is manufactured from cellulose. Synthetic polymer fibres with a cellulose base are all derived from petroleum.
Dietary fibres are produced from indigestible plant parts and frequently consist of long, repeated chains of carbohydrates. The majority of fibers come from cereal and grain husks, which contain the insoluble fibers cellulose and lignin. The bulk of plant fibers are made of cellulose, sometimes in combination with other materials like lignin.
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what is the minimum voltage required to generate h2 and o2 if the pressure on the gases at the depth of the wreckage (2 mi ) is 300 atm ?
A. 7 x 10^8 mole of H2 requires 8.48 x 10^10 Coulombs of electrical charge, and a voltage of 632.2 V. The minimum electrical energy required to raise the Titanic is 4.02 x 10^13 kW hr, and the minimum cost is $9.2 x 10^7.
1. The amount of H2 gas required to buoy the Titanic is 7 x 10^8 mole.
2. The number of Coulombs of electrical charge required to generate this amount of H2 gas is computed using Faraday's Law:
Q = nF
Where n is the number of moles of H2, F is the Faraday constant (96485 C/mol), and Q is the number of Coulombs.
Therefore, Q = (7 x 10^8) x (96485 C/mol) = 8.48 x 10^10 C.
3. The minimum voltage required to generate H2 and O2 gases is computed using the Nernst Equation:
E = E° - (RT/nF) ln(Q/Q°)
Where E is the voltage, E° is the standard voltage (1.229 V at 300 atm and 25°C), R is the gas constant (8.314 J/molK), T is the temperature (288 K at 2 miles depth), n is the number of moles of H2, F is the Faraday constant (96485 C/mol), Q is the number of Coulombs, and Q° is the standard charge (1 C).
Therefore, E = 1.229 - (8.314 J/molK x 288 K / (7 x 10^8 mol x 96485 C/mol)) ln(8.48 x 10^10 C / 1 C) = 632.2 V.
4. The minimum electrical energy required to raise the Titanic is calculated using the equation:
E = QV
Where E is the electrical energy, Q is the number of Coulombs, and V is the voltage.
Therefore, E = (8.48 x 10^10 C) x (632.2 V) = 4.02 x 10^13 kW hr.
5. The minimum cost of the electrical energy required to generate the necessary H2 gas is calculated using the equation:
Cost = (E x Price) / (1000 x 3600)
Where E is the electrical energy, Price is the cost per kW hr, and 1000 and 3600 are conversion factors.
Therefore, Cost = (4.02 x 10^13 kW hr x $0.23/kW hr) / (1000 kW hr/kW hr x 3600 s/hr) = $9.2 x 10^7.
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Complete question:
Some years ago a unique proposal was made to raise the Titanic. The plan involved placing pontoons within the ship using a surface‐controlled submarine‐type vessel. The pontoons would contain electrodes (cathodes) and would be filled with H2 gas as a result of the electrolysis of water. It has been estimated that it would require about 7 x 10^8 mole of H2 gas to provide the buoyancy to lift the ship
a) How many Coulombs of electrical charge would be required?
b) What is the minimum voltage required to generate H2 and O2 if the pressure on the gases at the depth of the wreckage (2 miles) is 300 atm?
c) What is the minimum electrical energy (in kW hr) required to raise the Titanic by electrolysis?
d) What is the minimum cost of the electrical energy required to generate the necessary H2 gas if the electricity costs $0.23 per kilowatt‐hour (kW hr) to generate at the site?
[Urgent!] - Equilibrium Problem
The equilibrium constant, K, for the following reaction
N₂(g) + O₂(g) ↔ 2NO(g)
is 4.00 x 10⁻² at a very high temperature. The reaction is at equilibrium at this temperature with [N2] = [O2] = 0.100 M and [NO] = 0.0200 M in a 2.00 liter flask. If 0.120 mol of NO is suddenly added to the reaction mixture what will be the concentrations of all species when equilibrium is re-established?
Answer:
√K = [.08-2x]/[.1+x]
Explanation:
As instructed by the question asker, I am putting this answer down. Hopefully it is correct (fingers crossed).
an aqueous solution of potassium bromide, kbr, has a concentration of 4.60 mol/l and has a density of 1.37 g/ml. what are the mass percent and mole fraction of kbr in this solution?
Mass percentage of potassium bromide KBr is 40.0% and the mole fraction of potassium bromide KBr is 0.0915.
The ratio of the mass of the solute contained in a solution to the mass of the solution as a whole is known as the mass percent. When the mass of the solute and the volume of the solution are supplied, the mass/volume percent is employed to indicate the Mole fraction concentration of the solution. Mole fraction is the ratio of the moles of one component to the total moles that represent all the components in a solution or other combination.
Brief explanation of solution :-
Molarity of KBr solution = 4.60 mol/L
Density of solution d= 1.37 g/mL
Molar mass of KBr=119.002 g/mol
a) Mass percentage of KBr ,(%):
We have formula that M = mxdx10/MW
Here, m is mass of KBr and MW is molar mass of KBr.
M is molarity of solution
Then, m= MXMW/dx10
= 4.60×119.002 /1.37×10
=39.95 or 40.0
mass percentage of KBr is 40.0%.
b) Mole fraction of KBr in solution:
Weight of solution, w = dxV
=1.37g/mL *1000mL
=1370g
So, mass of water, [tex]W_{H2O}[/tex] = 1370-(4.60x119.002)
=1370-547.409
= 822.59g
No. of moles of water = mass of water / MW. of water
= 822.59g/18.02 g/mol
=45.65mol
Now, the mole fraction of KBr (solute) is
квт = No. of moles of KBr / Total no. of moles in solution
= 4.60 mol (4.60+45.65)mol =0.0915
Mole fraction of KBr= 0.0915
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Which of the following best helps explain the trend of increasing atomic radius from N to Bi? A) The number of particles in the nucleus of the atom increases. Submit B The number of electrons in the outermost shell of the atom increases. Ğ¡ The attractive force between the valence electrons and the nuclei of the atoms decreases. D The repulsive force between the valence electrons and the electrons in the inner shells decreases.
The correct response is option C: The attractive interaction between the valence electrons and the atoms' nucleus weakens.
The force of attraction is an attraction that draws the body to it. In nature, there are many alluring forces at work. Among these are gravitational force, magnetic force, electric force, and electrostatic force.
The force of attraction between two bodies, according to Newton's law of gravitation, is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The gravitational force is always alluring in the natural world.
Give an illustration of an alluring force in nature.
Examples include gravitational force, electric force, electrostatic force, and magnetic force. Since it draws objects regardless of their distance, gravity is a well-known illustration of an attraction force.
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the metal, with an atomic radius of 144 pm, crystallizes in a face-centered cubic lattice. what is the density of the metal? 30.0 g/cm3 7.17 g/cm3 10.6 g/cm3 2.40. g/cm3 1.06 g/cm3
The density of the given metal is 19.4g/cm³ which is calculated using the density formula.
For the FCC crystal, atoms are in contact along the diagonal of the unit cell.
4r= √2a
where a is edge length of unit cell and r is radius of atom.
Substituting values in the above given expression, we get
r= 144pm
Number of the atoms per unit cell (FCC) =4
Mass of 1 unit cell = 197×4=788amu
=1.66×10⁻²⁷ ×788kg=1.30808×10⁻²⁴ kg
Volume of 1 unit cell =(407×10⁻¹² )³ m³
=6.741×10⁻²⁹
=2.824×10⁻²⁸
Hence the density= 1.30808×10⁻²⁴/ 6.741×10⁻²⁹
=19404.83kg/m³
=19.4g/cm³
The density of the crystal will be 19.4g/cm³
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which of the following is a strong acid in aqueous solution? a. h3po4 b. hclo c. h3po3 d. hno2 e. hbr
The correct option is Hydrobromic acid (hbr), This is the strong Acid when compared to the other acids
Hydrobromic acid is the term for aqueous HBr.
Hydrogen bromide will be the name if there is no water, or if it is not aqueous, while hydrobromic acid will be the name if it is acidic and aqueous. Because it is acid, the suffix ic is used, and because it is aqueous, the suffix hydro is used.
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In the event that a chemical gets in your eye while in the lab, you would use the eyewash station. In your at-home lab, however, which of these courses of action (according to your lab procedure) could be used in lieu of an eye wash station?.
In an at-home lab, the best course of action to take in the event that a chemical gets in your eye is to flush your eye with a clean water source.
What is eye wash station?An eye wash station is an emergency device used to provide immediate and sustained irrigation to the eyes in the event of a hazardous material splash or other accident involving the eyes. It consists of a bowl or basin of potable water connected to a pressurized water source, often with an adjustable flow-control device. Eye wash stations are designed to allow for the user to tilt their head back and irrigate both eyes at the same time, usually for a period of 15 minutes. This is necessary in order to remove hazardous material from the eye before it can cause damage. Eye wash stations should be installed in areas where hazardous materials are handled, stored, or used, as well as areas where workers may be exposed to hazardous materials. They should also be clearly marked and easily accessible in case of an emergency.
This can be done by holding your eye open and running clean water over it for at least 15 minutes. This will help to flush out the chemical and reduce the risk of eye damage. Additionally, it is important to seek medical attention as soon as possible after flushing your eye to ensure that the chemical did not cause any further damage.
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the specific heat capacity of water is 1.00 cal/g.0c. how much heat is required to raise the temperature of 25.0 g water from 22.0 0c to 50.0 0c?
The specific heat capacity of water is 1.00 cal/g.°C, 2940 J much heat is required to raise the temperature of 25.0 g water from 22°C to 50.0°C
What is specific heat capacity?The specific heat capacity is measured in J/(kg K) or J/(kg °C), and it is the amount of heat (J) absorbed per unit mass (kg) of the material when its temperature rises by 1 K (or 1 °C).
The amount of heat required to increase the temperature of 1 gram of a material by 1 degree Celsius (°C) is known as specific heat. Since water has a higher specific heat than other substances, it requires more energy to raise its temperature.
Given that,
T₁ = 22°C
T₂ = 50.0°C
here
Specific heat capacity of water (Cp) = 1.00 cal/g.°C = 4.2 J/g.°C
Heat required to convert liquid from 22°C to 50.0°C.
Q₁ = m × Cp × (T₂-T₁)
or, Q = 25 g × (4.2 J/g.°C) × (50-22) °C
or, Q = 2940 J
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What is the molar solubility of Fe(OH)2 at 25 C if K sp of the compound is 7.9 x 10^16?
2.8 x 10^8 M
5.8 x 10^6 M
2.0 x 10^16 M
9.2x10^6 M
The molar solubility of Fe(OH)2 at 25 C if K sp of the compound is 7.9 x 10^16 is 5.8 x 10^6 M.
The equilibrium solubility of Fe(OH)2 is as follows:
Fe(OH)2(s) <--------> Fe2+(aq) + 2OH-(aq)
The equilibrium constant expression for this equilibrium, i.e. Ksp, is as follows.
Ksp = [Fe2+] [OH-]2
where,
[Fe2+] = molar concentration of Fe2+
[OH-] = molar concentration of OH-
sp stands for solubility product
The value of Ksp = 7.9×10-16
Now,
Let S represent the molar solubility of Fe(OH)2.
Fe(OH)2 having one Fe2+ and two OH-
So,
[Fe2+] = 1S
[OH-] = 2S
substitute 1S and 2S in Ksp expression
Ksp = 1S × (2S)^2
Ksp = 4S^3
So,
4S^3 = 7.9 ×10^-16 M3
S^3 = 1.975 × 10^-16 M3
S = 5.8×10^-6 M
Therefore,
The Molar solubility of Fe(OH)2 = 5.8 ×10-6 M
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to neutralize a 40.0 ml sample of 0.120 m hcl using titration, what volume (ml) of the 0.120 m naoh would you need at the equivalence point of the titration?
At the equivalence point, the molarities of the two solutions are equal, so the volume of the NaOH required to neutralize the HCl is also 40.0 mL, for the titration.
The concentration of HCl multiplied by the volume of HCl must be equal to the concentration of NaOH multiplied by the volume of NaOH. The concentration of the HCl is 0.120 moles/L and the volume of the sample is 40.0 mL. This means that the concentration of NaOH multiplied by the volume of NaOH must equal 0.120 x 40.0 = 4.8 moles. The concentration of NaOH is also 0.120 moles/L, so the volume of NaOH must be 4.8/0.120 = 40.0 mL. This means that 40.0 mL of 0.120 m NaOH is needed at the equivalence point of the titration to neutralize a 40.0 mL sample of 0.120 m HCl. To determine the volume of 0.120 m NaOH needed at the equivalence point of a titration, the moles of HCl and NaOH must be equal. This means that the concentration of HCl multiplied by the volume of HCl must be equal to the concentration of NaOH multiplied
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