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  4. pH of a salt solution of wak acid (pKa = 4) weak base (pKb = 5) at 25ºC is :

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Q. pH of a salt solution of wak acid (pKa = 4) & weak base (pKb = 5) at 25ºC is :

AIIMSAIIMS 2019

Solution:

$pH=\frac{1}{2}\left(pKw + pka - pkb\right)=\frac{1}{2}\left(14 + 4 - 5\right) = 6.5$