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  4. 1 × 10-3 mole of HCl is added t a buffer solution made up of 0.01 M acetic and 0.01 M sodium acetate. The final pH of the buffer will be (given, pKa of acetic acid is 4.75 at 25°C)

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Q. $1 × 10^{-3}$ mole of HCl is added t a buffer solution made up of 0.01 M acetic and 0.01 M sodium acetate. The final pH of the buffer will be (given, $pK_a$ of acetic acid is 4.75 at 25$^{\circ}$C)

WBJEEWBJEE 2013Equilibrium

Solution:

$CH_{3}COO^{-} + H^{+} \to CH_{3} COOH$
image
$PH =PK_{a} \text{log} \frac{\text{(salt)}}{\text{(acid)}} = 4.75+ \text{log} \frac{0.009}{0.011}$
$=4.66$