pK_a of acetic acid is 4.74. The concentratio | vedclass

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Question

(A) The salt $CH_3COONa$ is a salt of a weak acid $(CH_3COOH)$ and a strong base $(NaOH)$.For such a salt,the $pH$ is given by the formula: $pH = \fra

Vedclass · Accepted Answer

$8.37$

Vedclass · Answer

(A) The salt $CH_3COONa$ is a salt of a weak acid $(CH_3COOH)$ and a strong base $(NaOH)$.For such a salt,the $pH$ is given by the formula: $pH = \frac{1}{2}[pK_w + pK_a + \log c]$.Given: $pK_w = 14$,$pK_a = 4.74$,and $c = 0.01 \ M = 10^{-2} \ M$.Substituting the values:$pH = \frac{1}{2}[14 + 4.74 + \log(10^{-2})]$$pH = \frac{1}{2}[18.74 - 2]$$pH = \frac{1}{2}[16.74] = 8.37$.

$pK_a$ of acetic acid is $4.74$. The concentration of $CH_3COONa$ is $0.01 \ M$. The $pH$ of $CH_3COONa$ is

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