The ksp of iron (ii) carbonate, feco3, is 3.13 * 10-11. calculate the solubility of this compound in g/l.

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