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 b

Question

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

Answer:

10

Solution:

$pH = pKa + \log \frac{[CB]}{[WA]}$
$5.74 = 4.74 + \log \frac{[CB]}{1}$
$\Rightarrow [CB] = 10 M$

$[CB] =$ Conjugate base.

$[WA] =$ Weak acid

TestHub · Accepted Answer

pH = pKa + log [ CB ] [ WA ] 5 . 74 = 4 . 74 + log [ CB ] 1 ⇒ [ CB ] = 10 M CB = Conjugate base. WA = Weak acid

Chemistry - Ionic Equilibrium Question with Solution | TestHub

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