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  • The pH of ammonium phosphate solution, if  of phosphoric acid and  of ammonium hyd

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_____
Option: 1 7
Option: 2 -
Option: 3 -
Option: 4 -

Answers (1)

best_answer

Since (NH4)3PO4 is salt of a weak acid (H3PO4) & weak base (NH4OH).

\begin{array}{l} \mathrm{pH}=7+\frac{1}{2}(\mathrm{pka}-\mathrm{pkb}) \\\\ =7+\frac{1}{2}(5.23-4.75) \\\\ =7.24 \approx 7 \end{array}

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sudhir.kumar

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