A 50 × 10^-4 M Solution of MnSO₄ Is Gradually Made

Multiple Choice

A 5.0 × 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 × 10^-13 and K_w = 1.01 × 10^-14.

A) 4.60
B) 9.57
C) 4.70
D) 9.30
E) 9.40