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Which expression is Ksp for dissolution of solid Ag₂CrO₄ in water?

A) [Ag⁺]²[CrO₄²⁻]

B) [Ag⁺][CrO₄²⁻]

C) moles of solid / liter of water

D) 1 / ([Ag⁺]²[CrO₄²⁻])

Answer: A

Explanation: Write dissolved-ion concentrations multiplied with exponents from the dissolution stoichiometry. The pure solid has constant activity and does not appear in Ksp.

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