The solubility-product constants, K sp, at 25 C for two compounds [iron(II) carbonate, FeCO3, and cadmium(II) carbonate,
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The solubility-product constants, K sp, at 25 ∘C for two compounds [iron(II) carbonate, FeCO3, and cadmium(II) carbonate, CdCO3] are given by the table
| Substance | K sp |
| FeCO3 | 2.10×10−11 |
| CdCO3 | 1.80×10−14 |
A solution of Na2CO3 is added dropwise to a solution that contains 1.12×10−2 M Fe2+ and 1.51×10−2 M Cd2+. What concentration of CO32− is need to initiate precipitation? Neglect any volume changes during the addition.
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