At 25 degrees C the Solubility product constant, Ksp, for strontium sulfate, SrSO4 is 7.6 x 10 to the -7, the solubility product constant for strontium fluoride, SrF2, is 7.9 X 10 to the -10

A. What is the Molar solubility of SrSO4 in pure water at 25 degrees C
B. What is the Molar solubility of SrF2 in pure water at 25 degrees C
C. An Aqueous solution of Sr(NO3)2 is added slowly to 1.0 liter of well-stirred solution containing 0.020 mole f- and 0.10 mol of SO4 2- at 25 degrees C. (you may assume that the added Sr(NO3)2 solution does not materially affect the total volume of the system)

1. Which salt precipitates first?
2. what is the concentration of strontium ion, Sr 2+. in the solution when the first precipitate begins to form?

D. as more Sr(NO3)2 is added to the mixture in (c) a second precipitate begins to form. At that stage, what precent of the anion of the first precipitate remains in solution?