Question

The fluoride ion concentration in a saturated solution of magnesium fluoride, MgF2, is 2.3 10-3 M. Calculate the value for the equilibrium constant.
............MgF2 ==> Mg^2+ + 2F^-
I...........solid.....0.......0
C...........solid.....x.......2x
E...........solid.....x.......2x

Ksp = (x)(2x)^2
You know x = 2.3E-3M.Substitute and solve for Ksp.

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