398
Complex Ions
11. What is the minimum concentration of CN~ that will prevent the precipitation
of Agl from a solution that is 0.100 M in I~ and 0.0100 M in Ag
+ ?
12. What must be the concentration of an NH 3 solution if 100 ml of it must
dissolve 3.00 g of AgCl together with 3.00 g of AgNO 3 ?
13. Calculate the pH of (a) a 0.100 M Cu(NO 3 ) 2 solution, and (b) a 0.100 M
Fe(NO 3 ) 3 solution.
14. The following questions involve the typical amphoteric hydroxides, Pb(OH) 2
and Sn(OH) 2 .
(a) Calculate the concentrations of Pb
2+ , Pb(OH)3~, and OH~ in a water solution saturated with Pb(OH) 2 .
(b) Calculate the Pb
2+ and Pb(OH);f concentrations in a solution that is saturated with Pb(OH) 2 and whose equilibrium NaOH concentration is 1.00 M.
(c) Calculate the Sn
2+ and SnCOH)^ concentrations that result from the addition of excess solid Sn(OH) 2 to 500 ml of 0.500 M NaOH.
(d) What is the minimum volume of 0.500 M NaOH needed to dissolve 0.100
mole of Pb(OH) 2 ?
PROBLEMS B
15. Give the proper names for each of the following complexes.
(a) Hg(H 2 0)i
+
(e) BF 4 -
(b) Fe(SCN) 6
3 -
(f) Cr(OH) 4 -
(c) Co(NH 3 ) 6
2+
(g) [Co(NH 3 ) 3 Cl 3 ]
(d) A1(C 2 0 4 )J16. What is the concentration of Cd
2+ in a solution made by diluting 0.100 mole of
CdSO 4 and 2.00 moles of NH 3 to 250 ml?
17. K.p for MX (mol wt = 125) is 1.00 x 10~
12 ; # inst for M(NH 3 ) 2
+ is 1.00 x 1Q10
. If
0.100 mole of MNO 3 is added to 500 ml of 3.00 M NH 3 solution, what are the
concentrations of (a) M(NH 3 ) 2
+ ; (b) NH 3 ; (c) M
+ ; (d) NOj; (e) H
+ ; (f) OH"?
18. If solid MX (see Problem 17) is added to 500 ml of 2.00 M NH 3 solution, how
many grams dissolve?
19. How many grams of AgBr will dissolve in 250 ml of a 6.00 M NH 3 solution?
20. What must be the final NH 3 concentration to dissolve 5.00 g of AgCl in 500 ml
of solution?
21. What must be the concentration of CaCl 2 solution to dissolve 3.00 g of AgCl in
500 ml of solution?
22. How many grams of Cu(OH) 2 will dissolve in 100 ml of 6.00 M NH 3 ?
23. What must be the NH 3 concentration in order to prevent the precipitation of
AgCl if the solution is 0.250 M in AgNO 3 and 2.00 M in NaCl?
Complex Ions
11. What is the minimum concentration of CN~ that will prevent the precipitation
of Agl from a solution that is 0.100 M in I~ and 0.0100 M in Ag
+ ?
12. What must be the concentration of an NH 3 solution if 100 ml of it must
dissolve 3.00 g of AgCl together with 3.00 g of AgNO 3 ?
13. Calculate the pH of (a) a 0.100 M Cu(NO 3 ) 2 solution, and (b) a 0.100 M
Fe(NO 3 ) 3 solution.
14. The following questions involve the typical amphoteric hydroxides, Pb(OH) 2
and Sn(OH) 2 .
(a) Calculate the concentrations of Pb
2+ , Pb(OH)3~, and OH~ in a water solution saturated with Pb(OH) 2 .
(b) Calculate the Pb
2+ and Pb(OH);f concentrations in a solution that is saturated with Pb(OH) 2 and whose equilibrium NaOH concentration is 1.00 M.
(c) Calculate the Sn
2+ and SnCOH)^ concentrations that result from the addition of excess solid Sn(OH) 2 to 500 ml of 0.500 M NaOH.
(d) What is the minimum volume of 0.500 M NaOH needed to dissolve 0.100
mole of Pb(OH) 2 ?
PROBLEMS B
15. Give the proper names for each of the following complexes.
(a) Hg(H 2 0)i
+
(e) BF 4 -
(b) Fe(SCN) 6
3 -
(f) Cr(OH) 4 -
(c) Co(NH 3 ) 6
2+
(g) [Co(NH 3 ) 3 Cl 3 ]
(d) A1(C 2 0 4 )J16. What is the concentration of Cd
2+ in a solution made by diluting 0.100 mole of
CdSO 4 and 2.00 moles of NH 3 to 250 ml?
17. K.p for MX (mol wt = 125) is 1.00 x 10~
12 ; # inst for M(NH 3 ) 2
+ is 1.00 x 1Q10
. If
0.100 mole of MNO 3 is added to 500 ml of 3.00 M NH 3 solution, what are the
concentrations of (a) M(NH 3 ) 2
+ ; (b) NH 3 ; (c) M
+ ; (d) NOj; (e) H
+ ; (f) OH"?
18. If solid MX (see Problem 17) is added to 500 ml of 2.00 M NH 3 solution, how
many grams dissolve?
19. How many grams of AgBr will dissolve in 250 ml of a 6.00 M NH 3 solution?
20. What must be the final NH 3 concentration to dissolve 5.00 g of AgCl in 500 ml
of solution?
21. What must be the concentration of CaCl 2 solution to dissolve 3.00 g of AgCl in
500 ml of solution?
22. How many grams of Cu(OH) 2 will dissolve in 100 ml of 6.00 M NH 3 ?
23. What must be the NH 3 concentration in order to prevent the precipitation of
AgCl if the solution is 0.250 M in AgNO 3 and 2.00 M in NaCl?