In the first reaction, we have $\mathrm{Hg}^{2+}$ and $\mathrm{I}^{-}$ ions. In the second reaction, there are no ions in the aqueous phase. In the third reaction, we have $\mathrm{H}_{3} \mathrm{PO}_{4}$, $\mathrm{OH}^{-}$, $\mathrm{PO}_{4}^{3-}$, and
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