Chemistry 112

Magnesium Arsenate:

Mg₃(AsO₄)₂(s) → ← 3 Mg²⁺(aq) + 2 AsO₄^3–(aq)

K_sp = [Mg²⁺]_e³[AsO₄^3–]_e² = 2×10^–20

Initial00

Change+3x+2x

Equilibrium3x2x

2×10^–20 = [3x]³[2x]² = 108x⁵

x = 5×10^–5

The solubility of magnesium arsenate = 5×10^–5 M

 

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