At T(K) in a saturated solution of MgCO$_3$ and Ag$_2$CO$_3$, if the concentration of Mg$^{2+}$ ion is $3.2\times10^{-5}$ M, then the concentration of Ag$^+$ ion in the solution will be [Given: $K_{sp}(MgCO_3)=1.6\times10^{-6}$ and $K_{sp}(Ag_2CO_3)=8.0\times10^{-12}$ at T(K)]
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In a solution saturated with multiple sparingly soluble salts sharing a common ion, the concentration of the common ion is the same for all solubility equilibria. You can use the information from one salt to find the common ion concentration and then use that to find an unknown concentration for the other salt.