Solubility = 0.0620g/L
Molar mass = 540.8g/mol
so moles of Srontium arsenate = 0.0620g/l / 540.8g/mol = 1.1465 * 10-4 moles - s
Sr3(AsO4)2---> 3Sr2+ + 2AsO43-
Ksp = (Sr2+)3 * (AsO43-)2
= (3s)3*(2s)2 = 108s5 = 108*(1.1465*10-4)5 = 2.14*10-18
Ksp = 2.14*10-18
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