When FeCO₃ dissolves it dissociates as follows FeCO₃ ---> Fe²⁺ + CO₃²⁻ first we need to calculate molar solubility of compound. Molar solubility is the number of moles that will dissolve in 1 L of solution lets take molar solubility of compound as x, then molar solubility of ions are also x ksp is the solubility constant ksp = [Fe²⁺][CO₃²⁻] 3.13 * 10⁻¹¹ = [x][x] x² = 3.13 * 10⁻¹¹ x = 5.6 * 10⁻⁶ mol/L next we need to convert molar solubility to g/L 5.6 * 10⁻⁶ mol/L * 115.8 g/mol = 648.48 * 10⁻⁶ solubility = 6.48 * 10⁻⁴ g/L
