The sulfate, SO42–, has a charge of –2. Calcium then has a charge of +2:
CaSO4(s) ⇌ Ca2+(aq) + SO42–(aq)
The solubility product of CaSO4•2H2O is 2.4 x 10–5. What mass of this salt will dissolve in 1.0 L of 0.010 M SO42−?
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