The compounds $\mathrm{NaH}_2 \mathrm{PO}_4$ and $\mathrm{Na}_2 \mathrm{HPO}_4$ are the conjugate acid-base pair of the phosphate buffer system. Here, $\mathrm{NaH}_2 \mathrm{PO}_4$ acts as the weak acid (HA) and $\mathrm{Na}_2 \mathrm{HPO}_4$ acts as the
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