1. Tardigrade
  2. Question
  3. Chemistry
  4. 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

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. 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___

JEE MainJEE Main 2021Equilibrium

Solution:

Since $\left( NH _{4}\right)_{3} PO _{4}$ is salt of weak acid $\left( H _{3} PO _{4}\right)$ & weak base $\left( NH _{4} OH \right)$

$pH =7+\frac{1}{2}( pka - pkb )$

$=7+\frac{1}{2}(5.23-4.75)$

$=7.24 \approx 7$