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JEE Main 20178 AprilOnline
Exam
JEE Main
Year
2017
Date
8 April
Mode
Online
Subject
Chemistry
Chapter
Ionic Equilibrium

JEE Main 2017 · 8 April · Online · Chemistry · Ionic Equilibrium

Addition of sodium hydroxide solution to a weak acid (HA) results...

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{10}^{- 5}, the ratio of salt to acid concentration in the buffer solution will be:

Options

  1. A10 : 1
  2. B4 : 5
  3. C5 : 4
  4. D1 : 10

Correct answer

A. 10 : 1

Step-by-step solution

pH=pka+log⁡[SaltAcid](∵ [Salt]=[Anion])<br/><br/>pH = {pk}_{a} + \log \left[\dfrac{Salt}{Acid}\right] (\text{∵ [Salt]=[Anion]})<br /><br />⇒ 6 = 5 + log SaltAcid<br/><br/>\dfrac{Salt}{Acid}<br /><br />⇒ 1 = log SaltAcid<br/><br/>\dfrac{Salt}{Acid}<br /><br />⇒ \log 10 = log SaltAcid<br/><br/>Saltacid=101\dfrac{Salt}{Acid}<br /><br />\dfrac{Salt}{acid} = \dfrac{10}{1}
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