A solution is prepared by mixing 50.0 mL of 0.50 M Cu(NO3)2 with 50.0 mL of 0.50 M Co(NO3)2. Sodium hydroxide is added to the mixture.
Which hydroxide precipitates first and what concentration of hydroxide ions present in solution will accomplish the separation?
Ksp = 2.2 10-20 for Cu(OH)2, Ksp = 1.3 10-15 for Co(OH)2
A) Co(OH)2; [OH-] = 6.9 x 10-6 M
D) Cu(OH)2; [OH-] = 1.1 x 10-9 M
B) Co(OH)2; [OH-] = 2.6 x 10-7 M
E) Cu(OH)2; [OH-] = 1.0 x 10-17 M
C) Cu(OH)2; [OH-] = 1.8 x 10-7 M