1. +-/4 points GVSUChem 116v2 15.c.1.P001 The Effect of a Common Ion on Molar So
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1. +-/4 points GVSUChem 116v2 15.c.1.P001 The Effect of a Common Ion on Molar Solubility: Theory The addition of a common ion has been shown to disturb a system at equilibrium. Naturally, the same effect works on solubility equilibria. a) The Ksp for CaF2 3.45 X 1011. What is the molar solubility of CaF2 in a 4 M solution of potassium fluoride? b) If you double the concentration of potassium fluoride, how would the molar solubility of CaF2 change? Answer by writing Increase, Decrease, or Stay the same? c) If you cut the concentration of potassium fluoride in half, how would the Ksp value change? Answer by writing Increase, Decrease or Stay the same?Explanation / Answer
Common ion effect
Addition of common ion reduces molar solubility
a) Ksp CaF2 = [Ca2+][F-]^2 = 3.45 x 10^-11
with,
[F-] = 4 M
molar solubility = [Ca2+] = 3.45 x 10^-11/(4)^2 = 2.16 x 10^-12 M
b) doubling the concentration of F-, would change the molar solubility
Decrease
c) reducing the concentration of F- to half, change in Ksp,
stay the same
Ksp is a constant, effect is only on the molar solubility
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