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\begin{array}{l}

\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}+\mathrm{H}_{3} \mathrm{PO}_{4}=\mathrm{Ca}\left(\mathrm{HPO}_{4}\right)_{2} \\

\mathrm{Cl}_{2}+\mathrm{KOH}=\mathrm{KCl}+\mathrm{KClO}_{3}+\mathrm{H}_{2} \mathrm{O}

\end{array}

Fig: 1