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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? [Ksp(Cu(OH)2) = 2.2 x 10^-20, Ksp(Co(OH)2) = 1.3 x 10^-15] a. Co(OH)2 b. Co(NO3)2 c. Cu(NO3)2 d. Cu(OH)2 e. No precipitate is formed.