The pH of ammonium phosphate solution, if of phosphoric acid and of ammonium hydroxide are 5.23 and 4.75 respectively, is (nearest integer).

Question

The pH of ammonium phosphate solution, if  of phosphoric acid and  of ammonium hydroxide are 5.23 and 4.75 respectively, is  (nearest integer).

Canvas Classes · Accepted Answer

Step 1 — Ammonium phosphate = :
This is a salt of weak acid () and weak base ().

Step 2 — pH formula for salt of weak acid + weak base:

Step 3 — Substitute:

JEE answer: 7.0 (using the specific pKa of the relevant ionisation step)

Answer: 7.0

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