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Determine the molar solubility of copper(II) cromate in a 0.75 M copper(II) chloride solution.(The Ksp of copper(II) cromate is 2.87*10^-8). I have no idea how to solve this problem!!!
 
Cu(CrO4) = Cu+2 + CrO4-2

Ksp = 2.87 x 10^-8 = [Cu+2][CrO4-2]

But the [Cu+2] is 0.75M form the CuCl2

2.87 x 10^-8 = (0.75+s)(s)

2.87 x 10^-8 = (0.75)(s)

solve for s, the solubility
 
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