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17.3   Algorithmic Questions

1) Calculate the pH of a solution that is 0.295 M in sodium formate (NaHCO2) and 0.205 M in formic acid (HCO2H). The Ka of formic acid is 1.77 × 10-4.

A) 3.910

B) 3.587

C) 13.84

D) 10.10

E) 4.963

2) Calculate the percent ionization of formic acid (HCO2H) in a solution that is 0.311 M in formic acid and 0.189 M in sodium formate (NaHCO2). The Ka of formic acid is 1.77 × 10-4.

A) 37.8

B) 0.0937

C) 11.3

D) 1.06 × 10-3

E) 3.529

3) Calculate the percent ionization of formic acid (HCO2H) in a solution that is 0.219 M in formic acid. The Ka of formic acid is 1.77 × 10-4.

A) 3.94 × 10-5

B) 0.0180

C) 2.84

D) 0.280

E) 12.2

4) Calculate the pH of a solution that is 0.210 M in nitrous acid (HNO2) and 0.290 M in potassium nitrite (KNO2). The acid dissociation constant of nitrous acid is 4.50 × 10-4.

A) 3.487

B) 3.210

C) 13.86

D) 10.51

E) 4.562

5) Calculate the percent ionization of nitrous acid in a solution that is 0.222 M in nitrous acid (HNO2) and 0.278 M in potassium nitrite (KNO2). The acid dissociation constant of nitrous acid is 4.50 × 10-4.

A) 55.6

B) 0.162

C) 15.5

D) 2.78 × 10-3

E) 3.448

6) Calculate the percent ionization of nitrous acid in a solution that is 0.249 M in nitrous acid. The acid dissociation constant of nitrous acid is 4.50 × 10-4.

A) 1.12 × 10-4

B) 0.0450

C) 4.25

D) 0.342

E) 5.53

7) What is the pH of a buffer solution that is 0.211 M in lactic acid and 0.111 M in sodium lactate? The Ka of lactic acid is 1.4 × 10-4.

A) 14.28

B) 10.43

C) 5.48

D) 3.57

E) 4.13

8) What is the pH of a buffer solution that is 0.255 M in hypochlorous acid (HClO) and 0.333 M in sodium hypochlorite? The Ka of hypochlorous acid is 3.8 × 10-8.

A) 13.88

B) 6.46

C) 8.49

D) 7.30

E) 7.54

9) A solution is prepared by dissolving 0.23 mol of hydrofluoric acid and 0.27 mol of sodium fluoride in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of HCl to this buffer solution causes the pH to drop slightly. The pH does not decrease drastically because the HCl reacts with the __________ present in the buffer solution. The Ka of hydrofluoric acid is 1.36 × 10-3.

A) H2O

B) H3O+

C) fluoride ion

D) hydrofluoric acid

E) This is a buffer solution: the pH does not change upon addition of acid or base.

10) A solution is prepared by dissolving 0.23 mol of hydrazoic acid and 0.27 mol of sodium azide in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of NaOH to this buffer solution causes the pH to increase slightly. The pH does not increase drastically because the NaOH reacts with the __________ present in the buffer solution. The Ka of hydrazoic acid is 1.9 × 10-5.

A) H2O

B) H3O+

C) azide

D) hydrazoic acid

E) This is a buffer solution: the pH does not change upon addition of acid or base.

Solution
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