College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 3
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3915) Which one of the following is the weakest acid?
15)
A) HF (K a = 6.8 × 10 -4 )
B) HClO (K a = 3.0 × 10 -8 )
C) HNO 2 (K a = 4.5 × 10 -4 )
D) HCN (K a = 4.9 × 10 -10 )
E) Acetic acid (K a = 1.8 × 10 -5 )
16) Of the acids in the table below, ________ is the strongest acid.
16)
Acid
K a
HOAc
1.8 × 10 -5
HCHO 2 1.8 × 10 -4
3.0 × 10 -8
HClO
HF
6.8 × 10 -4
A) HOAc
B) HCHO 2
C) HClO
D) HF
E) HOAc and HCHO 2
17) The K a of hypochlorous acid (HClO) is 3.0 × 10 -8 at 25.0 °C. What is the percent ionization of
17)
hypochlorous acid in a 0.015 M aqueous solution of HClO at 25.0 °C?
A) 4.5 × 10 -8
C) 2.1 × 10 -5
E) 1.4 × 10 -3
B) 14
D) 0.14
18) Classify the following compounds as weak acids (W) or strong acids (S):
18)
benzoic acid
nitric acid
acetic acid
A) W W W
B) S S S
C) S W W
D) W S S
E) W S W
19) Classify the following compounds as weak acids (W) or strong acids (S):
19)
hydrocyanic acid
hydrofluoric acid
phenol
A) W W W
B) S S S
C) S W W
D) W S S
E) W S W
20) Classify the following compounds as weak acids (W) or strong acids (S):
20)
nitrous acid
hydrochloric acid
hydrofluoric acid
A) W W W
B) S S S
C) S W W
D) W S S
E) W S W
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