In order to prepare a buffer solution of pH , 5.74 sodium acetate…

MCQ

In order to prepare a buffer solution of $pH\, 5.74$ sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is $1.0$ $M$, the concentration of sodium acetate in the buffer is ......... $M$. (Round off to the Nearest Integer).

[Given : $pKa$ (acetic acid) $=4.74$ ]

A
$5$
B
$15$
C
$20$
✓
$10$

✓

Answer

Correct option: D.

$10$

d
$pH = pKa +\log \frac{[ CB ]}{[ WA ]}$

$5.74=4.74+\log \frac{[ CB ]}{1}$

$\Rightarrow[ CB ]=10 M$

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