College Chemistry Ii Phs 1035 Practice Exam 3 With Answer Key Page 14
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
3983) The base-dissociation constant, K b , for pyridine, C 5 H 5 N, is 1.4 × 10 -9 . The acid-dissociation
83)
constant, K a , for the pyridinium ion, C 5 H 5 NH + , is ________.
A) 1.0 × 10 -7
B) 1.4 × 10 -23
C) 7.1 × 10 -4
D) 1.4 × 10 -5
E) 7.1 × 10 -6
84) The K a for HCN is 4.9 × 10 -10 . What is the value of K b for CN - ?
84)
A) 2.0 × 10 -5
B) 4.0 × 10 -6
C) 4.9 × 10 4
D) 4.9 × 10 -24
E) 2.0 × 10 9
85) K a for HF is 7.0 × 10 -4 . K b for the fluoride ion is ________.
85)
A) 2.0 × 10 -8
B) 1.4 × 10 -11
C) 7.0 × 10 -18
D) 7.0 × 10 -4
E) 1.4 × 10 3
86) K a for HCN is 4.9 × 10 -10 . What is the pH of a 0.068 M aqueous solution of sodium cyanide?
86)
A) 0.74
B) 2.96
C) 11.07
D) 13.24
E) 7.00
87) K a for HX is 7.5 × 10 -12 . What is the pH of a 0.15 M aqueous solution of NaX?
87)
A) 7.97
B) 1.96
C) 6.00
D) 8.04
E) 12.10
88) The pH of a 0.15 M aqueous solution of NaZ (the sodium salt of HZ) is 10.7. What is the K a for HZ?
88)
A) 1.6 × 10 -6
B) 6.0 × 10 -9
C) 8.9 × 10 -4
D) 1.3 × 10 -12
E) 3.3 × 10 -8
89) The conjugate base of NH 3 is ________.
89)
A) NH 2 -
B) NH 4 +
D) H 3 O +
E) OH -
C) NH 2 OH
90) The conjugate base of H 2 PO 4 - is ________.
90)
B) HPO 4 2-
C) PO 4 3-
D) H 3 O +
E) OH -
A) H 3 PO 4
14
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education