College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 12
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3969) A 0.15 M aqueous solution of the weak acid HA at 25.0 °C has a pH of 5.35. The value of K a for HA
69)
is ________.
A) 3.0 × 10 -5
B) 1.8 × 10 -5
C) 7.1 × 10 -9
D) 1.3 × 10 -10
E) 3.3 × 10 4
70) The K a of hypochlorous acid (HClO) is 3.00 × 10 -8 . What is the pH at 25.0 °C of an aqueous
70)
solution that is 0.0200 M in HClO?
A) +2.45
B) -2.45
C) -9.22
D) +9.22
E) +4.61
71) The K a of acetic acid (HC 2 H 3 O 2 ) is 1.8 × 10 -5 . What is the pH at 25.0 °C of an aqueous solution
71)
that is 0.100 M in acetic acid?
A) +2.87
B) -2.87
C) -11.13
D) +11.13
E) +6.61
72) The acid-dissociation constants of sulfurous acid (H 2 SO 3 ) are K a1 = 1.7 × 10 -2 and
72)
K a2 = 6.4 × 10 -8 at 25.0 °C. Calculate the pH of a 0.163 M aqueous solution of sulfurous acid.
A) 4.53
B) 1.28
C) 1.86
D) 6.21
E) 1.93
73) The acid-dissociation constants of phosphoric acid (H 3 PO 4 ) are K a1 = 7.5 × 10 -3 , K a2 = 6.2 × 10 -8 ,
73)
and K a3 = 4.2 × 10 -13 at 25.0 °C. What is the pH of a 2.5 M aqueous solution of phosphoric acid?
A) 1.82
B) 0.40
C) 2.51
D) 0.86
E) 0.13
74) The pH of a 0.55 M aqueous solution ammonia, NH 3 , at 25.0 °C is 11.50. What is the value of K b for
74)
NH 3 ?
A) 2.0 × 10 -9
B) 1.1 × 10 -9
C) 6.0 × 10 -5
D) 1.8 × 10 -5
E) none of the above
75) A 0.15 M aqueous solution of the weak base B at 25.0 °C has a pH of 8.88. The value of K b for B is
75)
________.
A) 3.0 × 10 -5
B) 1.8 × 10 -5
C) 3.9 × 10 -10
D) 1.3 × 10 -10
E) none of the above
12
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