JEE Main 2017ChemistryIonic EquilibriumMediumMCQ

JEE Main 2017 — Ionic Equilibrium Question with Solution

JEE Main 2017 (08 Apr Online)

Question

Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionization constant of HA is 10-5, the ratio of salt to acid concentration in the buffer solution will be:

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Show full solutionCorrect option: A
Correct answer
A10 : 1

Step-by-step explanation

pH=pka+log  Salt Acid   (∵ [Salt]=[Anion])

⇒6=5+log⁡  SaltAcid

⇒1=log ⁡SaltAcid

⇒log10=log ⁡SaltAcid 

Saltacid=101

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About this question

This is a previous-year question from JEE Main 2017, 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.