Chemistry - Ionic Equilibrium Question with Solution | TestHub

ChemistryIonic EquilibriumMiscellaneous/MixedEasy2 minPYQ_2020

ChemistryEasynumerical

A certain buffer solution contains equal concentration of $X^{-}$ and $HX$ . The $K_{a}$ for $HX$ is $1 0^{- 8}$ . The $pH$ of the buffer is

Answer:

8.00

Solution:

The Henderson equation is
$p H = p K_{a} + \log \frac{[C o n j u g a t e base]}{[A c i d]}$
$= - \log K_{a} + \log \frac{[X^{-}]}{[H X]}$
Hence, $[H X] = [X^{-}]$
$= - \log (1 0^{- 8}) + \log 1$
or pH = 8.0.

Stream:NTA_ABHYASSubject:ChemistryTopic:Ionic EquilibriumSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: PYQ_2020

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