QJEEM21Chb9b3: JEE Main 2021 Chemistry - Class 11 JEEM21Chb9b3 Solution: The pH of ammonium phosphate solution, if pk a of phosphoric…

Question

Verified Solution • 2025–26 Session moderate

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 ___________.

Accepted Answer

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

pH = 7 +

{1 \over 2}

(pk_a

-

pk_b)

= 7 +

{1 \over 2}

(5.23

-

4.75)

= 7.24

\approx

7.

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