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 × 10 −6 M
B) Co(OH) 2; [OH −] = 2.6 × 10 −7 M
C) Cu(OH) 2; [OH −] = 1.8 × 10 −7 M
D) Cu(OH) 2; [OH −] = 1.1 × 10 −9 M
E) Cu(OH) 2; [OH −] = 1.0 × 10 −17 M
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