Consider the dissociation equilibrium of the following weak acid:

$HA ⇌ H^{+} (aq) + A^{-} (aq)$

If the $p K_{a}$ of the acid is 4, then the pH of 10 mM HA solution is _____. (Nearest integer)

[Given: The degree of dissociation can be neglected with respect to unity] [2026]

Question

Consider the dissociation equilibrium of the following weak acid:

$HA ⇌ H^{+} (aq) + A^{-} (aq)$

If the $p K_{a}$ of the acid is 4, then the pH of 10 mM HA solution is _____. (Nearest integer)

[Given: The degree of dissociation can be neglected with respect to unity] [2026]

Smart Achievers · Accepted Answer

(3)

$pH = \frac{1}{2} [p K_{a} - \log c]$

$pH = \frac{1}{2} [4 - \log 10^{- 2}]$

$pH = 3$

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