A 40 $\times$ 10^-4 M Solution of MnSO₄ Is Gradually Made More Basic

Multiple Choice

A 4.0 $\times$ 10^-4 M solution of MnSO₄ is gradually made more basic by adding NaOH.At what pH will manganese(II) hydroxide begin to precipitate? The K_sp of Mn(OH) ₂ is 2.0 $\times$ 10^-13 and K_w = 1.01 $\times$ 10^-14.

A) 4.70
B) 9.57
C) 4.65
D) 9.35
E) 9.30