Question 1

Which one of the following will form a basic solution in water?

Accepted Answer

A)  NaBr 
B)  LiCN 
C)  NaCl 
D)  KClO4 
E)  NH4Cl 
A)  NaBr 
B)  LiCN 
C)  NaCl 
D)  KClO4 
E)  NH4Cl

Question 2

Calculate the hydronium ion concentration in an aqueous solution that contains 2.50 × 10-6 mol L-1 in hydroxide ion.

Accepted Answer

A)  4.00 × 10-7 mol L-1 
B)  4.00 × 10-8 mol L-1 
C)  4.00 × 10-9 mol L-1 
D)  5.00 × 10-9 mol L-1 
A)  4.00 × 10-7 mol L-1 
B)  4.00 × 10-8 mol L-1 
C)  4.00 × 10-9 mol L-1 
D)  5.00 × 10-9 mol L-1

Question 3

Calculate the pOH of a solution that contains 2.4 × 10-5 mol L-1 H3O⁺ at 25 °C.

Accepted Answer

A)  2.40 
B)  9.38 
C)  4.62 
D)  11.60 
E)  4.17 
A)  2.40 
B)  9.38 
C)  4.62 
D)  11.60 
E)  4.17

Question 4

Identify the weakest acid.

Accepted Answer

A)  HF 
B)  HCl 
C)  HBr 
D)  HI 
E)  All of the above are weak acids. 
A)  HF 
B)  HCl 
C)  HBr 
D)  HI 
E)  All of the above are weak acids.

Question 5

The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO) is 3.0 × 10-8 . At equilibrium, the molarity of H3O+ in a 0.030 mol L-1 solution of HClO is ________.

Accepted Answer

A)  1.52 mol L-1 
B)  3.3 × 10-10 mol L-1 
C)  4.52 mol L-1 
D)  0.030 mol L-1 
E)  3.0 × 10-5 mol L-1 
A)  1.52 mol L-1 
B)  3.3 × 10-10 mol L-1 
C)  4.52 mol L-1 
D)  0.030 mol L-1 
E)  3.0 × 10-5 mol L-1

Question 6

Find the percent ionization of a 0.200 mol L-1 solution of formic acid. The Ka of formic acid is 1.8 × 10-4.

Accepted Answer

A)  3.0% 
B)  2.0% 
C)  1.0% 
D)  3.5% 
E)  4.6% 
A)  3.0% 
B)  2.0% 
C)  1.0% 
D)  3.5% 
E)  4.6%

Question 7

Which of the following is an Arrhenius acid?

Accepted Answer

A)  H2SO4 
B)  LiOH 
C)  NH2CH3 
D)  CH3CH3 
E)  NH3 
A)  H2SO4 
B)  LiOH 
C)  NH2CH3 
D)  CH3CH3 
E)  NH3

Question 8

Which of the following is TRUE?

Accepted Answer

A)  A neutral solution contains [H2O] = [H3O⁺] 
B)  A neutral solution does not contain any H3O+ or OH- 
C)  An acidic solution has [H3O⁺] > [OH⁻] 
D)  A basic solution does not contain H3O+ 
E)  An acidic solution does not contain OH- 
A)  A neutral solution contains [H2O] = [H3O⁺] 
B)  A neutral solution does not contain any H3O+ or OH- 
C)  An acidic solution has [H3O⁺] > [OH⁻] 
D)  A basic solution does not contain H3O+ 
E)  An acidic solution does not contain OH-

Question 9

Determine the pOH of a 0.116 mol L-1 Ba(OH)2 solution at 25 °C.

Accepted Answer

A)  8.62 
B)  13.06 
C)  13.37 
D)  0.63 
E)  12.56 
A)  8.62 
B)  13.06 
C)  13.37 
D)  0.63 
E)  12.56

Question 10

Which of the following is a strong acid?

Accepted Answer

A)  C6H5CO2H 
B)  HCN 
C)  HClO4 
D)  NH4+ 
E)  H2O 
A)  C6H5CO2H 
B)  HCN 
C)  HClO4 
D)  NH4+ 
E)  H2O

Question 11

Calculate the concentration of bicarbonate ion, HCO3-, in a 0.0 10 mol L-1 H2CO3 solution that has the stepwise dissociation constants Ka1 = 4.3 × 10-7 and Ka2 = 5.6 × 10-11.

Accepted Answer

A)  6.6 × 10-5 mol L-1 
B)  4.3 × 10-7 mol L-1 
C)  4.3 × 10-9 mol L-1 
D)  5.6 × 10-11 mol L-1 
A)  6.6 × 10-5 mol L-1 
B)  4.3 × 10-7 mol L-1 
C)  4.3 × 10-9 mol L-1 
D)  5.6 × 10-11 mol L-1

Question 12

Calculate the pH of a solution that contains 3.9 × 10-4 mol L-1 H3O⁺ at 25 °C.

Accepted Answer

A)  4.59 
B)  3.41 
C)  10.59 
D)  9.41 
E)  0.59 
A)  4.59 
B)  3.41 
C)  10.59 
D)  9.41 
E)  0.59

Question 13

Which of the following is correct?

Accepted Answer

A)  The smaller the acid ionization constant is, the more the acid ionizes and the stronger the acid. 
B)  The larger the acid ionization constant is, the less the acid ionizes and the weaker the acid. 
C)  The smaller the acid ionization constant is, the less the acid ionizes and the weaker the acid. 
D)  The smaller the acid ionization constant is, the less the acid ionizes and the weaker its conjugate base is. 
E)  The smaller the acid ionization constant is, the more the acid ionizes and the weaker the acid. 
A)  The smaller the acid ionization constant is, the more the acid ionizes and the stronger the acid. 
B)  The larger the acid ionization constant is, the less the acid ionizes and the weaker the acid. 
C)  The smaller the acid ionization constant is, the less the acid ionizes and the weaker the acid. 
D)  The smaller the acid ionization constant is, the less the acid ionizes and the weaker its conjugate base is. 
E)  The smaller the acid ionization constant is, the more the acid ionizes and the weaker the acid.

Question 14

Which of the following is a Lewis base?

Accepted Answer

A)  AlF3 
B)  H2O 
C)  SiF4 
D)  C5H12 
E)  BH3 
A)  AlF3 
B)  H2O 
C)  SiF4 
D)  C5H12 
E)  BH3

Question 15

A solution with a hydroxide ion concentration of 4.15 × 10-6 mol L-1 is ________ and has a hydrogen ion concentration of ________.

Accepted Answer

A)  acidic; 2.41 × 10-8 mol L-1 
B)  acidic; 2.41 × 10-9 mol L-1 
C)  basic; 2.41 × 10-8 mol L-1 
D)  basic; 2.41 × 10-9 mol L-1 
A)  acidic; 2.41 × 10-8 mol L-1 
B)  acidic; 2.41 × 10-9 mol L-1 
C)  basic; 2.41 × 10-8 mol L-1 
D)  basic; 2.41 × 10-9 mol L-1

Question 16

Which of the following is a conjugate acid-base pair?

Accepted Answer

A)  NH4+/NH3 
B)  H3O⁺/OH⁻ 
C)  H2SO3/SO32⁻ 
D)  SO42-/SO32- 
E)  NaOH/Na+ 
A)  NH4+/NH3 
B)  H3O⁺/OH⁻ 
C)  H2SO3/SO32⁻ 
D)  SO42-/SO32- 
E)  NaOH/Na+

Question 17

Determine the pH in a 0.435 mol L-1 LiOH solution.

Accepted Answer

A)  13.6 
B)  0.24 
C)  13.37 
D)  0.6 
E)  12 
A)  13.6 
B)  0.24 
C)  13.37 
D)  0.6 
E)  12

Question 18

Determine the pH of a 0.116 mol L-1 Ba(OH)2 solution at 25 °C.

Accepted Answer

A)  8.62 
B)  13.06 
C)  13.37 
D)  0.63 
E)  12.56 
A)  8.62 
B)  13.06 
C)  13.37 
D)  0.63 
E)  12.56

Question 19

Determine the pOH of a 0.051 mol L-1 Sr(OH)2 solution at 25 °C.

Accepted Answer

A)  8.62 
B)  13.01 
C)  13.37 
D)  0.991 
E)  12.56 
A)  8.62 
B)  13.01 
C)  13.37 
D)  0.991 
E)  12.56

Question 20

Which of the following statements is TRUE?

Accepted Answer

A)  A strong acid is composed of a proton and an anion that have a very strong attraction for one another. 
B)  A weak base is composed of a cation and an anion with a very weak attraction between them. 
C)  A strong acid has a strong conjugate base. 
D)  The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid. 
E)  The dissociation reaction of a weak acid is completely shifted to the right. 
A)  A strong acid is composed of a proton and an anion that have a very strong attraction for one another. 
B)  A weak base is composed of a cation and an anion with a very weak attraction between them. 
C)  A strong acid has a strong conjugate base. 
D)  The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid. 
E)  The dissociation reaction of a weak acid is completely shifted to the right.

Exam 15: Acids and Bases

Which one of the following will form a basic solution in water?

Calculate the hydronium ion concentration in an aqueous solution that contains 2.50 × 10-6 mol L-1 in hydroxide ion.

Calculate the pOH of a solution that contains 2.4 × 10-5 mol L-1 H3O⁺ at 25 °C.

Identify the weakest acid.

The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO) is 3.0 × 10-8 . At equilibrium, the molarity of H3O+ in a 0.030 mol L-1 solution of HClO is ________.

Find the percent ionization of a 0.200 mol L-1 solution of formic acid. The Ka of formic acid is 1.8 × 10-4.

Which of the following is an Arrhenius acid?

Which of the following is TRUE?

Determine the pOH of a 0.116 mol L-1 Ba(OH)2 solution at 25 °C.

Which of the following is a strong acid?

Calculate the concentration of bicarbonate ion, HCO3-, in a 0.0 10 mol L-1 H2CO3 solution that has the stepwise dissociation constants Ka1 = 4.3 × 10-7 and Ka2 = 5.6 × 10-11.

Calculate the pH of a solution that contains 3.9 × 10-4 mol L-1 H3O⁺ at 25 °C.

Which of the following is correct?

Which of the following is a Lewis base?

A solution with a hydroxide ion concentration of 4.15 × 10-6 mol L-1 is ________ and has a hydrogen ion concentration of ________.

Which of the following is a conjugate acid-base pair?

Determine the pH in a 0.435 mol L-1 LiOH solution.

Determine the pH of a 0.116 mol L-1 Ba(OH)2 solution at 25 °C.

Determine the pOH of a 0.051 mol L-1 Sr(OH)2 solution at 25 °C.

Which of the following statements is TRUE?

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Filters

Calculate the hydronium ion concentration in an aqueous solution that contains 2.50 × 10^-⁶ mol L^-1in hydroxide ion.

Calculate the pOH of a solution that contains 2.4 × 10^-5 mol L^-1 H₃O⁺ at 25 °C.

The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO) is 3.0 × 10^-8. At equilibrium, the molarity of H₃O⁺ in a 0.030 mol L^-1 solution of HClO is ________.

Find the percent ionization of a 0.200 mol L^-1 solution of formic acid. The K_a of formic acid is 1.8 × 10^-4.

Determine the pOH of a 0.116 mol L^-1 Ba(OH)₂ solution at 25 °C.

Calculate the concentration of bicarbonate ion, HCO₃^-, in a 0.0 10 mol L^-1 H₂CO₃ solution that has the stepwise dissociation constants K_a1 = 4.3 × 10^-7 and K_a2 = 5.6 × 10^-11.

Calculate the pH of a solution that contains 3.9 × 10^-4 mol L^-1 H₃O⁺ at 25 °C.

A solution with a hydroxide ion concentration of 4.15 × 10^-⁶ mol L^-1 is and has a hydrogen ion concentration of .

Determine the pH in a 0.435 mol L^-1 LiOH solution.

Determine the pH of a 0.116 mol L^-1 Ba(OH)₂ solution at 25 °C.

Determine the pOH of a 0.051 mol L^-1 Sr(OH)₂ solution at 25 °C.