The reactions can be represented as follows:
\[
\begin{align*}
\text{Mg}^{2+} (aq) + \text{CO}_3^{2-} (aq) &\rightarrow \text{MgCO}_3 (s) \\
\text{Ca}^{2+} (aq) + \text{CO}_3^{2-} (aq) &\rightarrow \text{CaCO}_3 (s)
\end{align*}
\]
These reactions result in the
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