The pH of ammonium phosphate solution,if pK_a | vedclass

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(C) Ammonium phosphate $(NH_4)_3PO_4$ is a salt of a weak acid $(H_3PO_4)$ and a weak base $(NH_4OH)$.The formula for the $pH$ of a salt of a weak aci

Vedclass · Accepted Answer

$7$

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(C) Ammonium phosphate $(NH_4)_3PO_4$ is a salt of a weak acid $(H_3PO_4)$ and a weak base $(NH_4OH)$.The formula for the $pH$ of a salt of a weak acid and a weak base is:$pH = 7 + \frac{1}{2}(pK_a - pK_b)$Given:$pK_a = 5.23$$pK_b = 4.75$Substituting the values:$pH = 7 + \frac{1}{2}(5.23 - 4.75)$$pH = 7 + \frac{1}{2}(0.48)$$pH = 7 + 0.24$$pH = 7.24$Rounding to the nearest integer,the $pH$ is approximately $7$.

The $pH$ of ammonium phosphate solution,if $pK_a$ of phosphoric acid and $pK_b$ of ammonium hydroxide are $5.23$ and $4.75$ respectively,is ..... .

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