Chemistry (Chang), 10th Edition

Chapter 15: Acids and Bases

Self Assessment B

1
In the reaction HCO3-(aq) + HPO42-(aq) ----> H2CO3(aq) + PO43-(aq), the conjugate acid-base pairs are
A)HCO3- (acid) and H2CO3 (conjugate base); PO43- (base) and HPO42- (conjugate acid)
B)HCO3- (acid) and PO43- (conjugate base); HPO42- (base) and H2CO3 (conjugate acid)
C)HCO3- (base) and HPO42- (conjugate acid); H2CO3 (acid) and PO43- (conjugate base)
D)HCO3- (base) and H2CO3 (conjugate acid); HPO42- (acid) and PO43- (conjugate base)
2
What is the H+ concentration in an aqueous solution in which [OH-] = 1.2 x 10-5 M? Assume that the solution temperature is 25 oC.
A)8.3 x 10-10 M
B)1.2 x 10-19 M
C)1.2 x 10-5 M
D)1.0 x 10-14 M
E)None of the above.
3
Calculate the hydroxide ion concentration in a solution with pH = 6.389.
A)1.00 x 10-14 M
B)4.08 x 10-7 M
C)9.92 x 10-7 M
D)2.45 x 10-8 M
E)None of the above.
4
What is the pH of 15 mL of 0.0045 M HNO3?
A)4.17
B)2.35
C)3.35
D)5.35
E)10.0
5
What is the pH of a 675 mL aqueous solution containing 0.036 mol of NaOH?
A)3.41
B)10.58
C)12.73
D)1.27
E)13.00
6
What is the pH of a 2.5 x 10-2 M acetic acid solution? Ka of acetic acid = 1.8 x 10-5.
A)6.35
B)3.17
C)1.60
D)12.7
E)None of the above.
7
A 0.10 M solution of an acid, HA, has a pH of 3.0. What is the Kb of the conjugate base, A-, of this acid?
A)1 x 10-3
B)1 x 10-11
C)1 x 10-9
D)1 x 10-5
E)1 x 10-14
8
Which of the compounds listed below would be the strongest acid?
A)F3COH
B)FCH2OH
C)FCH2SH
D)F3CSH
E)CH3OH
9
Which one of the following salts will form an acidic solution when dissolved in water?
A)NaNO3
B)NH4Cl
C)KNO2
D)NaCN
E)KClO2
10
Which of the following species is a basic oxide?
A)CO2
B)SiO2
C)GeO2
D)B2O3
E)Li2O
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