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  4. For a weak acid HA , the value of Ka=10- 4, then calculate the pH of 0.01 M solution of this acid.

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Q. For a weak acid $HA$ , the value of $K_{a}=10^{- 4},$ then calculate the $pH$ of $0.01\,M$ solution of this acid.

NTA AbhyasNTA Abhyas 2022

Solution:

$H^{+}=\sqrt{K_{a} \times C}$
$H^{+}=\sqrt{10^{- 4} \times 10^{- 2}}=10^{- 3}molL^{- 1}$
$pH=-\log\left[10^{- 3}\right]=3$