1. Tardigrade
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  3. Chemistry
  4. HA is a weak acid. its pKa is 4.80. The pKb of a weak base, BOH is 4.78. Find the pH of an aqueous solution of the salt, BA .

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Q. $HA$ is a weak acid. its $pK_{a}$ is $4.80.$ The $pK_{b}$ of a weak base, $BOH$ is $4.78.$ Find the $pH$ of an aqueous solution of the salt, $BA$ .

NTA AbhyasNTA Abhyas 2020

Solution:

Given that $pK_{a}=4.80$ and $pK_{b}=4.78$
$pH=7+\frac{1}{2}\left(p K_{a} - p K_{b}\right)$
$=7+\frac{1}{2}\left(4.80 - 4.78\right)=7.01$