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A solution is prepared by adding 4.5 mol of potassium hydroxide to 1.00 L of 1.00...

A solution is prepared by adding 4.5 mol of potassium hydroxide to 1.00 L of 1.00
M MnSO4. What is the equilibrium concentration of Mn2+ ions?
Kf = 5.0 × 109 for Mn(OH)42–.
(A) 3.2 × 10–9 M
(B) 5.0 × 10–9 M
(C) 3.2 × 10–10 M

(D) 2.0 × 10–11 M

(E) 4.9 × 10–13 M

The answer is A. Please show work.

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