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JEE Main202126 Feb 2021Evening ShiftChemistryIonic EquilibriumActual

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

7

Step-by-step solution

Since NH 4 3 PO 4 is salt of weak acid H 3 PO 4 and weak base NH 4 OH pH = 7 + 1 2 pka - pkb = 7 + 1 2 5 . 23 - 4 . 75 = 7 . 24 ≈ 7

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