Q.

pH of a mixture containing 0.10 M X- (base) and 0.20 M HX with pKb(X-) = 4 is

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a

4 + log 2

b

4 - log 2

c

10 + log 2

d

10 - log 2

answer is D.

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Detailed Solution

By Henderson's equationpOH=pKb+log[HX]X−=4+log⁡2 ∴ pH=14−pOH=10−log⁡2
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