Question 1
1. The magnitude of Kw indicates that ________.
water autoionizes very slowly water autoionizes very quickly water autoionizes only to a very small extent the autoionization of water is exothermic Question 2
1. Which one of the following is the weakest acid?
HF (Ka = 6.8 × 10-4)
HClO (Ka = 3.0 × 10-8)
HNO2 (Ka = 4.5 × 10-4)
HCN (Ka = 4.9 × 10-10)
Acetic acid (Ka = 1.8 × 10-5) Question 3
1. Which solution will be the most basic?
0.10 M Ba(OH)2 0.10 M KOH 0.10 M H2O
0.10 M CH3OH
All solutions have equal basicity. Question 4
1. Using the data in the table, which of the conjugate bases below is the weakest base? OAcC7H5O2- NO2FOAc- and C7H5O2- Question 5
1. Calculate the concentration (in M) of hydronium ions in a solution at 25.0 °C with a pOH
of 4.223.
5.98 × 10-5
1.67 × 10-10
1.67 × 104
5.99 × 10-19
1.00 × 10-7 Question 6
1. Ka for HF is 7.0 × 10-4. Kb for the fluoride ion is ________.
2.0 × 10-8
1.4 × 10-11
7.0 × 10-18 7.0 × 10-4
1.4 × 103 Question 7
1. The Ka of hypochlorous acid (HClO) is 3.0 × 10-8 at 25.0 °C. Calculate the pH of
a 0.385M hypochlorous acid solution.
3.05 9.53 4.47 6.52 -3.05 Question 8
1. Which one of the following is a Brownsted-Lowry base?
(CH3)3N
CH3COOH
HF HNO2
None of these Question 9
1. What is the conjugate base of OH-?
O2
O- H2O
O2H3O+ Question 10
1. The pH of a 0.25 M aqueous solution of hydrofluoric acid, HF, at 25.0 °C is 2.03. What is
the value of Ka for HF?
2.0 × 10-9 1.1 × 10-9
6.0 × 10-5
3.5 × 10-4 None of these Question 11
1. What is the pH of a 0.020 M aqueous solution of barium hydroxide?
12.60 12.30 1.70 10.41 1.40 Question 12
1. Z- is a weak base. An aqueous solution of NaZ is prepared by dissolving 0.350 mol of
NaZ in sufficient water to yield 1.0 L of solution. The pH of the solution was 8.93 at 25.0
°C. The Kb of Z- is ________.
1.2 × 10-5
6.9 × 10-9
2.1 × 10-10
9.9 × 10-2
2.8 × 10-12 Question 13
1. Ka for HCN is 4.9 × 10-10. What is the pH of a 0.068 M aqueous solution of sodium
cyanide?
0.74 2.96 11.07 13.24 7.00 Question 14
1. Which solution below has the highest concentration of hydronium ions?
pH = 3.0 pH = 10 pH = 7.0 pH = 6.4 pH = 11.2 Question 15 1. What is the pOH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydroxide
ion?
8.40 5.60 9.00 3.98 7.00 Question 16
1. Classify the following compounds as weak acids (W) or strong acids (S):
Nitrous acid hydrochloric acid hydrofluoric acid WWW SSS SWW WSS WSW Question 17
1. Classify the following compounds as weak bases (W) or strong bases (S): Methylamine carbonate ion potassium hydroxide WWS SSS SWW WSS WSW Question 18
1. Of the following, which is the weakest acid?
HPO3H3PO4
H2PO4HPO4The acid strength of all of these is the same. Question 19
1. Determine the pOH of a 0.10 M aqueous solution of KF. For hydrofluoric acid, 1.00 5.92 8.08 5.01 1.58 Question 20
1. Calculate the pOH of a 0.0727 M aqueous sodium cyanide solution at 25.0 °C. Kb for
CN- is
9.33 10.00 5.22 1.14 8.78

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