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Byju's Answer

Standard XII

Chemistry

Auto Protolysis of Water

Assertion : ...

Question

Assertion : $p H$ value of acidic buffer solution change, if buffer solution is diluted upto very large extent Reason: $[H^{+}]$ decrease due to change in concentration as well as $α$ and decrease in concentration is more as compared to increase in $α$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A solution that resists change in pH value upon addition of small amount of strong acid or base (less than 1 %) or when solution is diluted is called buffer solution.

But pH value of acidic buffer solution change, if buffer solution is diluted upto very large extent because $[H^{+}]$ decrease due to change in concentration and decrease in concentration is more significant as compared to increase in $α$ .

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Assertion :pH value of acidic buffer solution change, if buffer solution is diluted upto very large extent Reason: [H+] decrease due to change in concentration as well as α and decrease in concentration is more as compared to increase in α

Assertion : $p H$ value of acidic buffer solution change, if buffer solution is diluted upto very large extent Reason: $[H^{+}]$ decrease due to change in concentration as well as $α$ and decrease in concentration is more as compared to increase in $α$