College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 19
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39122) Calculate the pOH of a 0.0727 M aqueous sodium cyanide solution at 25.0 °C. K b for CN - is
122)
4.9 × 10 -10 .
A) 9.33
B) 10.00
C) 5.22
D) 1.14
E) 8.78
123) Calculate the pH of a 0.0727 M aqueous sodium cyanide solution at 25.0 °C. K b for CN - is
123)
4.9 × 10 -10 .
A) 9.33
B) 10.00
C) 5.22
D) 1.14
E) 8.78
124) Determine the pH of a 0.15 M aqueous solution of KF. For hydrofluoric acid, K a = 7.0 × 10 -4 .
124)
A) 0.82
B) 5.83
C) 8.17
D) 5.01
E) 1.17
125) Determine the pOH of a 0.10 M aqueous solution of KF. For hydrofluoric acid, K a = 7.0 × 10 -4 .
125)
A) 1.00
B) 5.92
C) 8.08
D) 5.01
E) 1.58
126) Calculate the pH of 0.726 M anilinium hydrochloride (C 6 H 5 NH 3 Cl) solution in water, given that
126)
K b for aniline is 3.83 × 10 -4 .
A) 1.78
B) 12.22
C) 5.36
D) 8.64
E) 12.42
127) Calculate the pOH of 0.606 M anilinium hydrochloride (C 6 H 5 NH 3 Cl) solution in water, given that
127)
K b for aniline is 3.83 × 10 -4 .
A) 1.82
B) 12.18
C) 5.40
D) 8.60
E) 12.42
128) K b for NH 3 is 1.8 × 10 -5 . What is the pH of a 0.40 M aqueous solution of NH 4 Cl at 25.0 °C?
128)
A) 2.57
B) 11.43
C) 9.18
D) 4.82
E) 11.23
129) K b for NH 3 is 1.8 × 10 -5 . What is the pOH of a 0.20 M aqueous solution of NH 4 Cl at 25.0 °C?
129)
A) 2.72
B) 11.28
C) 9.02
D) 4.98
E) 11.23
130) The K a for formic acid (HCO 2 H) is 1.8 × 10 -4 . What is the pH of a 0.20 M aqueous solution of
130)
sodium formate (NaHCO 2 )?
A) 11.64
B) 5.48
C) 3.39
D) 8.52
E) 4.26
131) Of the following, which is the strongest acid?
131)
A) HIO 4
B) HIO 3
C) HIO 2
D) HIO
E) The acid strength of all of the above is the same.
19
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