The ph of 0.5 m aqueous solution of hf

Asked by admin @ 17/08/2021 in Chemistry viewed by 327 People

The pH of 0.5 m aqueous solution of HF ( Ka=2×10-⁴) is

Answered by admin @ 17/08/2021

Answer: pH = 2

Explanation:

$HF\rightleftharpoons H^++F^-$

I 0.5 0 0

E $0.5-0.5\alpha$ $0.5\alpha$ $0.5\alpha$

$K_a=\frac{[H^+][F^-]}{[HF]}$

$2\times 10^{-4}=\frac{[0.5\alpha][0.5\alpha]}{[0.5-0.5\alpha]}$

$\alpha=2\times 10^{-2}$

$[H^+]=0.5\alpha=0.5\times 2\times 10^{-2}=10^{-2}$

$pH=-log[H^+]$

$pH=-log[10^{-2}]=2$

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