College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 18
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39114) The K a of hydrazoic acid (HN 3 ) is 1.9 × 10 -5 at 25.0 °C. What is the pH of a 0.15 M aqueous
114)
solution of HN 3 ?
A) 0.82
B) 1.95
C) 5.23
D) 2.77
E) -3.46
115) The base-dissociation constant of ethylamine (C 2 H 5 NH 2 ) is 6.4 × 10 -4 at 25.0 °C. The [H + ] in a
115)
1.4 × 10 -2 M solution of ethylamine is ________ M.
A) 3.7 × 10 -12
B) 2.7 × 10 -3
C) 3.3 × 10 -12
D) 3.0 × 10 -3
E) 11.43
116) Calculate the pH of a 0.500 M aqueous solution of NH 3 . The K b of NH 3 is 1.77 × 10 -5 .
116)
A) 8.95
B) 11.47
C) 2.53
D) 11.77
E) 2.23
117) A 0.1 M aqueous solution of ________ will have a pH of 7.0 at 25.0 °C.
117)
LiF
RbBr
NaClO 4
NH 4 Cl
A) RbBr and NaClO 4
B) LiF and RbBr
C) NaClO 4 only
D) LiF only
E) NH 4 Cl only
118) An aqueous solution of ________ will produce a basic solution.
118)
A) Na 2 SO 3
B) RbBr
C) Mg(ClO 4 ) 2
D) NH 4 NO 3
E) KNO 3
119) An aqueous solution of ________ will produce an acidic solution.
119)
A) NH 4 I
B) KBr
C) Sr(ClO 4 ) 2
D) K 2 CO 3
E) NaNO 3
120) An aqueous solution of ________ will produce a neutral solution.
120)
A) LiNO 3
B) NaNO 2
C) KF
D) Rb 2 CO 3
E) NH 4 NO 3
121) The acid-dissociation constant of hydrocyanic acid (HCN) at 25.0 °C is 4.9 × 10 -10 . What is the pH
121)
of an aqueous solution of 0.050 M sodium cyanide (NaCN)?
A) 11.00
B) 3.00
C) 1.0 × 10 -3
D) 9.9 × 10 -12
E) 2.5 × 10 -11
18
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