454
Answers to Problems of the A Groups
21. Agl is converted to Ag 2 S because the [Ag
+ ] available from Agl and the [S
2 ~] possible
in 5 M HC1 exceed the K sp for Ag 2 S.
22. 131 liters
23. (a) 2.00 x 10~
16 M
(c) 5.33 x 10~
5 M
(b) 2.67 x 10~
7 M
24. 1.01 x 10~
13 M
25. (a) [H+]
2 [CO
2 -] = 7.11 x 10~
19
(b) 5.29
(c) 2.29 x 10-" M
(d) The method isn't practical because there is not enough difference between the
A" sp values for the various carbonates.
26. Mn(OH) 2 will precipitate first.
27. (a) 4.56 x 1Q-" M
(b) 3.19 x 10'
6 M
CHAPTER 25
1. (a) hexaaquo magnesium(II)
4. 3.33 g
(b) hexahydroxo antimonate(III)
(c) dithiosulfato silver(I)
8
(d) dioxalato nickelate(II)
6. 0.836 M
(e) hexaammine cobalt(III)
(f) dinitrodiammine nickel(II)
7 "
12
'
5 M
(g) tetraiodo mercurate(II)
8. 1.65 x 10~
4
2. 4.77 x 10-'
6 M
9. 3.55 M
3. (a) 0.100 M
10. 9.51 x 10~
8 M
(b) 1.80 M
(c) 3.09 x 10-'° M
(d) 0.100 M
(e) 1.79 x 1012 M
(f) 5.60 x 103 M
11. Initial concentration must be 0.0201 M
Final concentration must be 9.81 x 10~
5 M
12. 5.03
13. (a) 4.17
(b) 1.62
14. (a) [OH-]
= 1.00 x 105 M
(c) [Sn
2+ ]
= 3.19 x lO"
26 M
[Pb
2+
]
= 5.00 x 106 M
[Sn(OH) 3 -] = 0.0556 M
[Pb(OH) 3 -] = 4.00 x 10~
7 M
(d) 5.20 liters
(b) [Pb
2+ ]
= 5.00 x 10-'" M
[Pb(OH) 3 -] = 0.0400 M