Question

if alpha is the degree of dissociation of weak dibasic organic acid and y is the hydrogen ion concentration,what is the initial concentration of acid

Answer 1

Answer: Concentration of dibasic oraganic acid is $\frac{y(1-\alpha)}{2\alpha}$.

Explanation: We are given a weak dibasic acid. Reaction of dissociation of acid is given by:

                    $H_2A\rightarrow 2H^++A^{2-}$

At t = 0,           c         0         0

At $t=t_{eq}$    $c(1-\alpha)$    $2c\alpha$       $c\alpha$

where, $\alpha$ = degree of dissociation

We are given the concentration of hydrogen ion = y.

$[H^+]=y$

$2c\alpha=y$

$c=\frac{y}{2\alpha}$

From this, we can calculate the the concentration of $H_2B$

$[H_2B]=c(1-\alpha)$

$[H_2B]=\frac{y(1-\alpha)}{2\alpha}$