Question

pKa for acetic acid is 4.74. what should be the ratio of concentration of acetic acid and acetate ion to have in solution of pH 5.74​

Answer 1

as it is a buffer solution

ph = pka +log [salt ]/[ acid ]

5.74= 4.74+ k

k= 1

log salt /acid =1

salt /acid = 10

Answer 2

The ratio of concentration of acetic acid and acetate ion to have in solution of pH 5.74​ is 1: 10

Explanation:

$CH_3COOH\rightarrow CH_3COO^-+H^+$

To calculate the concentration of acetic acid and acetate ion, we use Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$5.74=4.74+\log (\frac{[CH_3COO^-]}{[CH_3COOH]})$

$(\frac{[Salt]}{Acid})=antilog(1)=10^1$

$(\frac{[Acid}{Salt})=\frac{1}{10}$

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