19. A. Solid calcium nitrate is slowly added to175 mL of a 0.0676 Mpotassium carbonate solution. The concentration ofcalcium ion required to just initiateprecipitation is _____ M.
B. Solid zinc acetate is slowly added to125 mL of a 0.0515 Mpotassium cyanide solution. The concentration ofzinc ion required to just initiate precipitationis _____ M.
C. Solid sodium hydroxide is slowly added to150 mL of a 0.0435 Mcopper(II) acetate solution. The concentration ofhydroxide ion required to just initiateprecipitation is _____ M.
