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Factors Affecting Alpha

What is the e...

Question

What is the equilibrium constant for the reaction
$H B (a q .) + N a A (a q .) ⇌ H A (a q .) + N a B (a q .)$ ?

10

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0.1

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10^{- 7}

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10^{- 11}

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Solution

The correct option is D $10$
As we know, at half point of equivalence point
$p H = p K a$ and from figure it can be seen that at half point
$p H = 5$ for HB so its pKa is 5.
Similarly pKa is 6 for HA.
For this reaction,
$K = K_{H B} / K_{H A} = 10^{- 5} / 10^{- 6} = 10$

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