College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 17
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39106) What is the pH of a 0.020 M aqueous solution of barium hydroxide?
106)
A) 12.60
B) 12.30
C) 1.70
D) 10.41
E) 1.40
107) What is the pOH of a 0.030 M solution of barium hydroxide?
107)
A) 12.78
B) 12.48
C) 1.52
D) 1.22
E) 10.41
108) Hydrochloric acid is a strong acid. This means that ________.
108)
A) HCl dissociates completely to H + (aq) and Cl - (aq) when it dissolves in water
B) HCl does not dissociate at all when it is dissolved in water
C) HCl produces a gaseous product when it is neutralized
D) HCl cannot be neutralized by a weak base
E) aqueous solutions of HCl contain equal concentrations of H + (aq) and OH - (aq)
109) The acid-dissociation constant at 25.0 °C for hypochlorous acid (HClO) is 3.0 × 10 -8 . At
109)
equilibrium, the molarity of H 3 O + in a 0.066 M solution of HClO is ________.
A) 4.4 × 10 -5
B) 0.066
C) 2.2 × 10 -10
D) 4.35
E) 1.18
110) In which of the following aqueous solutions does the weak acid exhibit the highest percentage
110)
ionization?
A) 0.01 M H 2 SO 3 (K a = 1.4 × 10 -2 )
B) 0.01 M HCN (K a = 6.2 × 10 -10 )
C) 0.01 M H 2 CO 3 (K a = 4.5 × 10 -7 )
D) 0.01 M HC 3 H 5 O 2 (K a = 1.3 × 10 -5 )
E) 0.01 M HOCl (K a = 3.5 × 10 -8 )
111) In which of the following aqueous solutions does the weak acid exhibit the lowest percentage
111)
ionization?
A) 0.01 M HCN (K a = 6.2 × 10 -10 )
B) 0.01 M H 2 CO 3 (K a = 4.5 × 10 -7 )
C) 0.01 M HNO 2 (K a = 4.0 × 10 -4 )
D) 0.01 M HCHO 2 (K a = 1.8 × 10 -4 )
E) 0.01 M HOCl (K a = 3.5 × 10 -8 )
112) The K a of hypochlorous acid (HClO) is 3.0 × 10 -8 at 25.0 °C. Calculate the pH of a 0.0385 M
112)
hypochlorous acid solution.
A) 3.05
B) 9.53
C) 4.47
D) 6.52
E) -3.05
113) The K a of hydrofluoric acid (HF) at 25.0 °C is 6.8 × 10 -4 . What is the pH of a 0.45 M aqueous
113)
solution of HF?
A) 4.05
B) 1.76
C) 3.64
D) 0.35
E) 1.41
17
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