JEE Main 2021ChemistryIonic EquilibriumMediumNumerical

JEE Main 2021 — Ionic Equilibrium Question with Solution

JEE Main 2021 (18 Mar Shift 1)

Question

In order to prepare a buffer solution of pH5.74, sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is 1.0 M, the concentration of sodium acetate in the buffer is ______M. (Round off to the Nearest Integer). Given: pKaacetic acid=4.74

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Show full solutionCorrect answer: 10
Correct answer
10

Step-by-step explanation

pH=pKa+log[CB][WA]
5.74=4.74+log[CB]1
⇒[CB]=10M

CB =Conjugate base.

WA =Weak acid

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About this question

This is a previous-year question from JEE Main 2021, covering the Ionic Equilibrium chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.