Chemistry (Chang), 10th Edition

Chapter 15: Acids and Bases

Self Assessment A

1
What is the conjugate acid of HS-?
A)HS2
B)S2-
C)HS
D)H2S
E)SOH
2
What is the H+ concentration in a 5.7 x 10-3 M Ca(OH)2 solution?
A)5.7 x 10-17 M
B)8.8 x 10-13 M
C)8.77 x 10-11 M
D)3.1 x 10-10 M
E)1.75 x 10-12 M
3
The pH of a certain solution is 4.5. What is the concentration of H+(aq) ions in the solution?
A)3.16 x 10-5 M
B)3.16 x 104 M
C)4.5 M
D)3.16 x 10-10 M
E)1.9 x 1019 M
4
The pH of a 0.1 M solution of acid HA is 1.0. Therefore,
A)HA is a strong acid.
B)Ka of HA is 1.
C)Ka of HA is 0.1.
D)Ka of HA is 0.01.
E)HA must be a weak acid; not enough information is given to determine Ka.
5
The pH of a 0.30 M solution of an acid, HA, is 5.20. Calculate Ka of HA.
A)3.98 x 10-11
B)6.3 x 10-6
C)7.52 x 10-5
D)1.33 x 10-10
E)None of the above
6
What is the pH of a solution prepared by dissolving 0.250 mol of NH3 in sufficient water to make 1.00 L of solution (Kb NH3 = 1.8 x 10-5)?
A)4.50
B)2.12
C)11.33
D)2.67
E)None of the above
7
What is the pH of a 1.0 M solution of NaCN? [Ka HCN = 4.9 x 10-10]
A)2.3
B)11.7
C)7.0
D)4.7
E)9.3
8
Calculate the [HS-] of a 0.33 M solution of H2S [Ka1 = 5.7 x 10-8; Ka2 = 1.2 x 10-15].
A)1.37 x 10-4 M
B)1.88 x 10-8 M
C)5.7 x 10-8 M
D)1.2 x 10-15 M
E)7.55 x 10-5 M
9
Which of the following salts will form an acidic solution when dissolved in water?
A)NaCl
B)NaNO2
C)NH4NO3
D)NH4CN
E)B and D
10
Which of the following species can act as a Lewis acid?
A)NH3
B)F-
C)H2O
D)NH4+
E)BF3
11
What is the percent ionization of a 0.20 M solution of C6H5COOH with Ka of 6.5x10-5?
A)1.0%
B)1.8%
C)3%
D)4.6%
12
Write the formula for the conjugate acid of CO32-
A)HCO3-
B)H2CO3-
C)HCO2-2
D)None of the above
13
Which is the strongest acid?
A)hydrofluoric acid
B)boric acid
C)benzoic acid
D)iodic acid
14
Which is the strongest polyprotic acid?
A)oxalic
B)tartaric
C)phosphoric
D)phosphorous
15
Predict the pH of an aqueous solution of CsF.
A)acidic
B)neutral
C)basic
D)none of the above
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