Three sparingly soluble salts are placed in separate beakers containing distilled…

CHEMISTRY · Multi-part · AP · Chemistry · Equilibrium · Equilibrium

Problem

Three sparingly soluble salts are placed in separate beakers containing distilled water at 25 °C. Their solubility-product constants are listed below.
SaltFormulaKspK_{sp}
Calcium fluorideCaF2_23.9×10−113.9\times10^{-11}
Barium sulfateBaSO4_41.1×10−101.1\times10^{-10}
Lead(II) iodidePbI2_27.9×10−97.9\times10^{-9}
Assume no additional equilibria are relevant and that activity coefficients are unity. (a) For each salt, express KspK_{sp} in terms of the molar solubility ss. (b) Calculate the numerical value of ss (in mol L−1^{-1}) for each salt. (c) Rank the three salts from greatest to least molar solubility and state the numerical value used to justify each position in the ranking.

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