A Solution Is Prepared by Mixing 50

question 89

Multiple Choice

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 slowly added to the mixture. Which precipitates first? [K_sp(Cu(OH) ₂) = 2.2 × 10^-20, K_sp(Co(OH) ₂) = 1.3 × 10^-15]

• A) Co(OH)₂
• B) Co(NO₃)₂
• C) Cu(NO₃)₂
• D) Cu(OH)₂
• E) No precipitate is formed.

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