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Standard IX

Chemistry

Arrehenius Theory of Acids and Bases

Assertion :In...

Question

Assertion :In a titration of weak acid with strong base, the $p H$ at the half equivalence point is $p K_{a}$ Reason: At half equivalence point, it will form acidic buffer at it's maximum capacity where [acid] = [salt]

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
When we titrate weak acid with strong base

$H A + N a O H \to H_{2} O + N a A$

at half equivalence point $N a A = H A$

$p H = p K_{a} + log (\frac{s a l t (N a A)}{a c i d (H A)})$

$p H = p K_{a}$ $[∵ N a A = H A]$ (Acid = Salt)
Option (A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Assertion :In a titration of weak acid with strong base, the pH at the half equivalence point is pKa Reason: At half equivalence point, it will form acidic buffer at it's maximum capacity where [acid] = [salt]

Assertion :In a titration of weak acid with strong base, the $p H$ at the half equivalence point is $p K_{a}$ Reason: At half equivalence point, it will form acidic buffer at it's maximum capacity where [acid] = [salt]