Consider this equation in chemical equilibrium. cap h sub 2 SO sub 4 A q if and only if 2 cap h raised to the plus A q power plus SO sub 4 raised to the 2 minus power A q The addition of which compound will cause a shift in equilibrium because of a common ion effect?

MgSO₄ dissolves to produce Mg²⁺ and SO₄²⁻ ions. The sulfate ion is already a product in the equilibrium, so adding it shifts the equilibrium toward H₂SO₄ to reduce the added sulfate, according to Le Châtelier’s principle. Thus, MgSO₄ causes a shift through the common-ion effect.

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