College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 28
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39187) The K sp for Zn(OH) 2 is 5.0 × 10 -17 . Determine the molar solubility of Zn(OH) 2 in a buffer solution
187)
with a pH of 11.5.
A) 5.0 × 10 6
B) 1.2 × 10 -12
C) 1.6 × 10 -14
D) 5.0 × 10 -12
E) 5.0 × 10 -17
188) How many milliliters of 0.120 M NaOH are required to titrate 50.0 mL of 0.0998 M nitrous acid to
188)
the equivalence point? The K a of nitrous acid is 4.5 × 10 -4 .
A) 3.43
B) 50.0
C) 41.6
D) 60.1
E) 3.17
189) Calculate the pH of a solution that is 0.278 M in sodium formate (NaHCO 2 ) and 0.222 M in formic
189)
acid (HCO 2 H). The K a of formic acid is 1.77 × 10 -4 .
A) 3.843
B) 3.647
C) 13.90
D) 10.16
E) 4.954
190) Calculate the percent ionization of formic acid (HCO 2 H) in a solution that is 0.322 M in formic acid
190)
and 0.178 M in sodium formate (NaHCO 2 ). The K a of formic acid is 1.77 × 10 -4 .
A) 35.6
B) 0.1011
C) 10.8
D) 1.03 × 10 -3
E) 3.488
191) Calculate the percent ionization of formic acid (HCO 2 H) in a solution that is 0.152 M in formic acid.
191)
The K a of formic acid is 1.77 × 10 -4 .
A) 2.74 × 10 -5
B) 0.0180
C) 3.44
D) 0.581
E) 8.44
192) Calculate the pH of a solution that is 0.322 M in nitrous acid (HNO 2 ) and 0.178 M in potassium
192)
nitrite (KNO 2 ). The acid dissociation constant of nitrous acid is 4.50 × 10 -4 .
A) 3.093
B) 3.607
C) 14.26
D) 10.91
E) 4.589
193) Calculate the percent ionization of nitrous acid in a solution that is 0.241 M in nitrous acid (HNO 2 )
193)
and 0.195 M in potassium nitrite (KNO 2 ). The acid dissociation constant of nitrous acid is
4.50 × 10 -4 .
A) 44.7
B) 0.229
C) 13.5
D) 2.11 × 10 -3
E) 3.258
28
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