The pH of ammonium phosphate solution, if pk _ a of phosphoric acid...

The

pH

of ammonium phosphate solution, if

{pk}_{a}

of phosphoric acid and

{pk}_{b}

of ammonium hydroxide are

5 . 23

and

4 . 75

respectively, is

Correct answer

Step-by-step solution

Since ${\left({NH}_{4}\right)}_{3}{PO}_{4}$ is salt of weak acid \left({H}_{3}{PO}_{4}\right) $and weak base \left({NH}_{4}OH\right)</p><p>$ pH = 7 + \dfrac{1}{2}\left(pka - pkb\right)

$= 7 +$ \dfrac{1}{2}\left(5 . 23 - 4 . 75\right)

$= 7 . 24 \approx 7$

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