Answer
Ksp = 27[PO43-]5/8
Explanation
Solubility equilibrium of Ca3(PO4)2 is
Ca3(PO4)2(s) <---------> 3Ca2+(aq) + 2PO42-(aq)
Ksp = [Ca2+]3 [ PO43-]2
[Ca2+] = (3/2) [PO43-]
Ksp = ((3/2)[PO43-])3[PO43-]2
Ksp = 27[PO43-]5/8
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