Calculate the volume of water required to dissolve 0.39 g of calcium fluoride to get a saturated solution. ( K s p of CaF 2 = 3.2 × 1 0 − 11 , atomic masses: Ca = 40 u, F = 19 u)

Question

Calculate the volume of water required to dissolve 0.39 g of calcium fluoride to get a saturated solution. ( K s p ​ of CaF 2 ​ = 3.2 × 1 0 − 11 , atomic masses: Ca = 40 u, F = 19 u)

TestHub · Accepted Answer

CaF 2 ​ gives Ca 2 + + 2 F − : K s p ​ = 4 s 3 = 3.2 × 1 0 − 11 , so s 3 = 8 × 1 0 − 12 and s = 2 × 1 0 − 4 M . Molar mass of CaF 2 ​ = 40 + 38 = 78 g/mol , so 0.39 g = 5 × 1 0 − 3 mol. V = 2 × 1 0 − 4 5 × 1 0 − 3 ​ = 25 L . Answer: 25 L.

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