A certain buffer solution contains equal concentration of X^- and… - Vidyadip

MCQ

A certain buffer solution contains equal concentration of $X^-$ and $HX$. The $K_b$ for $X^-$ is $10^{-10}$. The $pH$ of the buffer is

✓
$4$
B
$7$
C
$10$
D
$14$

✓

Answer

Correct option: A.

$4$

a
$pH = pKa + \log \,\frac{{\left[ {{X^ - }} \right]}}{{\left[ {HX} \right]}}$

$K_a × K_b = K_w$

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