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Answer #1

The solubility product of CaSO4 in water is , Ksp = 7.1 x 10-5

CaSO4 Ca 2+ + SO42-

Let S be the solubility of CaSO4

Then [Ca2+ ]= S

       [SO42- ] = S

Solubility product , Ksp = [Ca2+ ] [SO42- ]

                                 = S x S

                                 = S2

Molar mass of CaSO4 is = 40+32+(4x16)= 136 gmol-1

So solubility , S = 136 x 8.43x10 -3 g/L

                        = 1.146 g/ L

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