A weak acid H X ( K a = 10 – 5 ) on reaction with NaOH gives NaX. For 0.1 M aqueous solution of NaX, the % hydrolysis is

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A weak acid $H X (K_{a} = 10^{- 5})$ on reaction with NaOH gives NaX. For 0.1 M aqueous solution of NaX, the % hydrolysis is

ChemistryIonic EquilibriumNEET

Options:

A 0.001%
B 0.01%
C 0.15%
D 1%

Solution:

2472 Upvotes Verified Answer

The correct answer is: 0.01%

\begin{matrix} X^{-} & + & H_{2} O & ⇌ & HX & + & {OH}^{-} \\ 1 - h & h & h \end{matrix}

$h = \sqrt{\frac{K_{w}}{K_{a} \times C}} = \sqrt{\frac{10^{- 14}}{10^{- 5} \times 0.1}} = 10^{- 4}$

Or $10^{- 2} %$ i.e., $0.01 %$

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