Which is the correct representation of the solubility product constant of — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

# Solubility Product Constant of $Ag_2CrO_4$ **Step 1: Write the dissolution equation** $$Ag_2CrO_4(s) \rightleftharpoons 2Ag^+(aq) + CrO_4^{2-}(aq)$$ **Step 2: Apply the solubility product expression** The $K_{sp}$ includes only aqueous ions raised to the power of their stoichiometric coefficients. Solids are excluded. **Step 3: Construct the expression** $$K_{sp} = [Ag^+]^2[CrO_4^{2-}]$$ **Why this is correct:** - The coefficient of $Ag^+$ is 2, so it's squared - The coefficient of $CrO_4^{2-}$ is 1, so it appears to the first power - The solid $Ag_2CrO_4$ is not included in the expression (solids have activity = 1) This is the standard form for any sparingly soluble salt: multiply ion concentrations raised to their stoichiometric coefficients.