If the Ksp of FeCO3=2.1x10^-11, Ksp of CdCO3=1.8x10^-14 A solution of Na2CO3 is

Question

If the Ksp of FeCO3=2.1x10^-11, Ksp of CdCO3=1.8x10^-14

A solution of Na2CO3 is added dropwise to a solution that contains 1. 10 times 10-2 M Fe2+ and 1. 60 times 10-2 M Cd2+. What concentration of CO32- is need to initiate precipitation? Neglect any volume changes during the addition. Express your answer with the appropriate units. In the solution from Part A, what will the concentration of CO32- be when Fe2+ begins to precipitate? Express your answer with the appropriate units. What will the concentration of Cd2+ be when Fe2+ begins to precipitate? Express your answer with the appropriate units.

Explanation / Answer

[CO3 2-] = 1.91 x 10^-9 M Ksp = [Cd2+][CO3 2-] 1.8 x 10^-14 = [Cd2+] (1.91 x 10^-9) [Cd2+] = 9.42 x 10^-6M

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