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Ksp = [Mg2+] [OH-]
= s. (2s)2
= 4s3
4 x 10-12 = 4s3
s = 10-4
dalam 500 cm3 kelarutannya adalah 5 x 10-5
massanya = 5x 10-5 x 58
= 2,9 x 10-3