49. The solubility of Mg(OH)2(s) in water at a certain temperature is 1.1x10-4 mol/L. Calculate the value of Ksp for Mg(OH)2(s) at this temperature.
(A) 1.1 x 10-4
(B) 1.3 x 10-12
(C) 1.2 x 10-8
(D) 5.3 x 10-12
(E) none of these

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