Question 1

Which of the following color changes can be observed when excess sodium hydroxide is added to acetic acid and phenolphthalein is used as an indicator?

Accepted Answer

A)  from colorless to pink 
B)  from red to yellow 
C)  from pink to colorless 
D)  from yellow to red 
A)  from colorless to pink 
B)  from red to yellow 
C)  from pink to colorless 
D)  from yellow to red

Question 2

Which of the following is a monoprotic acid?

Accepted Answer

A)  H2CO3 
B)  H2SO4 
C)  H3PO4 
D)  HNO3 
A)  H2CO3 
B)  H2SO4 
C)  H3PO4 
D)  HNO3

Question 3

Which of the following is true of the position of equilibrium in an acid-base reaction?

Accepted Answer

A)  The position of equilibrium lies on the side of the weaker acid and weaker base. 
B)  The position of equilibrium lies on the side of the stronger acid and stronger base. 
C)  The position of equilibrium lies on the side of the weaker acid and stronger base. 
D)  The position of equilibrium lies on the side of the stronger acid and weaker base. 
A)  The position of equilibrium lies on the side of the weaker acid and weaker base. 
B)  The position of equilibrium lies on the side of the stronger acid and stronger base. 
C)  The position of equilibrium lies on the side of the weaker acid and stronger base. 
D)  The position of equilibrium lies on the side of the stronger acid and weaker base.

Question 4

Examine the activity series given below.   Where are the strongest reducing agents located in the given activity series?

Accepted Answer

A)  They are located near the top of the series. 
B)  They are located near the middle of the series. 
C)  They are located near the bottom of the series. 
D)  The strength of a reducing agent depends on the substance being reduced. 
A)  They are located near the top of the series. 
B)  They are located near the middle of the series. 
C)  They are located near the bottom of the series. 
D)  The strength of a reducing agent depends on the substance being reduced.

Question 5

Which of the following must be known while carrying out a titration?

Accepted Answer

A)  the concentrations of all the reactants except one 
B)  the stoichiometric ratio of the reactants 
C)  the volumes of all the reactants 
D)  all of these 
A)  the concentrations of all the reactants except one 
B)  the stoichiometric ratio of the reactants 
C)  the volumes of all the reactants 
D)  all of these

Question 6

A sodium hydroxide solution has a pH of 11.40. What is its [OH−]?

Accepted Answer

A)  4.0 × 10−26 M 
B)  4.0 × 10−12 M 
C)  2.5 × 10−3 M 
D)  2.5 × 1011 M 
A)  4.0 × 10−26 M 
B)  4.0 × 10−12 M 
C)  2.5 × 10−3 M 
D)  2.5 × 1011 M

Question 7

Which of the following is the net ionic equation for the reaction of the strong acid HCl with the weak base NH3?

Accepted Answer

A)  H3O+(aq) + Cl−(aq) + NH3(aq) → NH4+(aq) + Cl−(aq) + H2O(l) 
B)  H3O+(aq) + NH3(aq) → NH4+(aq) + H2O(l) 
C)  HCl(aq) + NH3(aq) → NH4Cl(aq) 
D)  none of these 
A)  H3O+(aq) + Cl−(aq) + NH3(aq) → NH4+(aq) + Cl−(aq) + H2O(l) 
B)  H3O+(aq) + NH3(aq) → NH4+(aq) + H2O(l) 
C)  HCl(aq) + NH3(aq) → NH4Cl(aq) 
D)  none of these

Question 8

Which of the following is the conjugate acid of H2PO4−?

Accepted Answer

A)  H3PO4 
B)  HPO42− 
C)  PO43− 
D)  H3O+ 
A)  H3PO4 
B)  HPO42− 
C)  PO43− 
D)  H3O+

Question 9

Which of the following ions does an acid produce according to the original Arrhenius definition of an acid?

Accepted Answer

A)  H+ 
B)  OH− 
C)  H2O 
D)  none of these 
A)  H+ 
B)  OH− 
C)  H2O 
D)  none of these

Question 10

Which of the following buffers will have the best buffer capacity?

Accepted Answer

A)  a solution containing 0.2 M HC2H3O2 and 0.2 M NaC2H3O2 
B)  a solution containing 0.2 M HC2H3O2 and 0.2 M NaC2H3O2. 
C)  a solution containing 0.2 M HC2H3O2 and 0.2 M NaC2H3O2.. 
D)  They all have the same buffer capacity. 
A)  a solution containing 0.2 M HC2H3O2 and 0.2 M NaC2H3O2 
B)  a solution containing 0.2 M HC2H3O2 and 0.2 M NaC2H3O2. 
C)  a solution containing 0.2 M HC2H3O2 and 0.2 M NaC2H3O2.. 
D)  They all have the same buffer capacity.

Question 11

Which of the following is true of pH?

Accepted Answer

A)  It is a measure of the acid and base concentration of a neutral solution. 
B)  It is a measure of the acid concentration of a solution. 
C)  It is a measure of the base concentration of a solution. 
D)  It is a measure of the overall acidity or basicity of a solution. 
A)  It is a measure of the acid and base concentration of a neutral solution. 
B)  It is a measure of the acid concentration of a solution. 
C)  It is a measure of the base concentration of a solution. 
D)  It is a measure of the overall acidity or basicity of a solution.

Question 12

Which of the following body fluids is always basic?

Accepted Answer

A)  pancreatic fluid 
B)  saliva 
C)  urine 
D)  all of these 
A)  pancreatic fluid 
B)  saliva 
C)  urine 
D)  all of these

Question 13

Which of the following statements best describes the acid-base relationship?

Accepted Answer

A)  As acid strengths increase, conjugate base strengths increase. 
B)  As base strengths increase, conjugate acid strengths increase. 
C)  As acid strengths increase, conjugate base strengths and conjugate acid strengths increase 
D)  None of these 
A)  As acid strengths increase, conjugate base strengths increase. 
B)  As base strengths increase, conjugate acid strengths increase. 
C)  As acid strengths increase, conjugate base strengths and conjugate acid strengths increase 
D)  None of these

Question 14

Which of the following solutions can function as a buffer?

Accepted Answer

A)  a solution containing HCl and NaCl 
B)  a solution containing NaOH and NaCl 
C)  a solution containing NH3 and NH4Cl 
D)  none of these 
A)  a solution containing HCl and NaCl 
B)  a solution containing NaOH and NaCl 
C)  a solution containing NH3 and NH4Cl 
D)  none of these

Question 15

Which of the following is not a base?

Accepted Answer

A)  PO43− 
B)  OH− 
C)  NH3 
D)  None, they are all bases. 
A)  PO43− 
B)  OH− 
C)  NH3 
D)  None, they are all bases.

Question 16

The pKa of formic acid is 3.75. What is the Ka of formic acid?

Accepted Answer

A)  1.8 × 10−18 
B)  5.6 × 10−11 
C)  1.8 × 10−4 
D)  5.6 × 103 
A)  1.8 × 10−18 
B)  5.6 × 10−11 
C)  1.8 × 10−4 
D)  5.6 × 103

Question 17

In a particular titration experiment, a 30.0-mL sample of an unknown monoprotic acid required 25.0 mL of 0.200 M NaOH for the end point to be reached. What is the concentration of the acid?

Accepted Answer

A)  0.120 M 
B)  0.167 M 
C)  0.240 M 
D)  0.333 M 
A)  0.120 M 
B)  0.167 M 
C)  0.240 M 
D)  0.333 M

Question 18

Which of the following substances will react with an acid to produce a gas?

Accepted Answer

A)  Al(s) 
B)  Na2CO3(aq) 
C)  both Al(s) and Na2CO3(aq) 
D)  none of these 
A)  Al(s) 
B)  Na2CO3(aq) 
C)  both Al(s) and Na2CO3(aq) 
D)  none of these

Question 19

Which of the following acids has the weakest conjugate base?

Accepted Answer

A)  CH3COOH 
B)  C6H5OH 
C)  H2SO4 
D)  H3PO4 
A)  CH3COOH 
B)  C6H5OH 
C)  H2SO4 
D)  H3PO4

Question 20

Which of the following species can be characterized as amphiprotic?

Accepted Answer

A)  H2O 
B)  HCO3− 
C)  HPO42− 
D)  all of these 
A)  H2O 
B)  HCO3− 
C)  HPO42− 
D)  all of these

Exam 8: Acids and Bases

Which of the following color changes can be observed when excess sodium hydroxide is added to acetic acid and phenolphthalein is used as an indicator?

Which of the following is a monoprotic acid?

Which of the following is true of the position of equilibrium in an acid-base reaction?

Examine the activity series given below. Where are the strongest reducing agents located in the given activity series?

Which of the following must be known while carrying out a titration?

A sodium hydroxide solution has a pH of 11.40. What is its [OH−]?

Which of the following is the net ionic equation for the reaction of the strong acid HCl with the weak base NH3?

Which of the following is the conjugate acid of H2PO4−?

Which of the following ions does an acid produce according to the original Arrhenius definition of an acid?

Which of the following buffers will have the best buffer capacity?

Which of the following is true of pH?

Which of the following body fluids is always basic?

Which of the following statements best describes the acid-base relationship?

Which of the following solutions can function as a buffer?

Which of the following is not a base?

The pKa of formic acid is 3.75. What is the Ka of formic acid?

In a particular titration experiment, a 30.0-mL sample of an unknown monoprotic acid required 25.0 mL of 0.200 M NaOH for the end point to be reached. What is the concentration of the acid?

Which of the following substances will react with an acid to produce a gas?

Which of the following acids has the weakest conjugate base?

Which of the following species can be characterized as amphiprotic?

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A sodium hydroxide solution has a pH of 11.40. What is its [OH⁻]?

Which of the following is the net ionic equation for the reaction of the strong acid HCl with the weak base NH₃?

Which of the following is the conjugate acid of H₂PO₄⁻?

The pK_a of formic acid is 3.75. What is the K_a of formic acid?