Chemistry - Ionic Equilibrium Question with Solution | TestHub

ChemistryIonic EquilibriumHydrolysis of SaltsEasy2 minPYQ_2021

ChemistryEasystatement

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

Answer:

Solution:

Since ${({NH}_{4})}_{3} {PO}_{4}$ is salt of weak acid $(H_{3} {PO}_{4})$ and weak base $({NH}_{4} OH)$

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

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

$= 7.24 \approx 7$

Stream:JEESubject:ChemistryTopic:Ionic EquilibriumSubtopic:Hydrolysis of Salts

⏱ 2mℹ️ Source: PYQ_2021

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