Chemistry Solubility Problem -HELP!

[kirsten_2009]

1. The problem statement, all variables and given/known data

A.) Calculate the molar solubility of barium fluoride BAF2 in water at 25 degrees Celsius. The solubility product constant for BaF2 at this temperature is 1.0 x 10^-16

B.) What is the molar solubility of BaF2 in 0.15 M NaF at 25 degrees Celsius? Compare the solubility in this case with that of BaF2 in pure water.

2. Relevant equations

A + B --> C + D

Ksp = [D][C] / [A]

[b]3. The attempt at a solution

No clue...

[Borek]

What is exact formula for Ksp of BaF2? How are the concentrations of F- and Ba2+ related? (hint: take a look at the compound formula).

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