Question

If $\alpha$ is the degree of disociation of weak dibasic organic acid and $y$ is the hydrogen ion concentration, what is the initial concentration of acid:

• A. $\frac{\alpha (y{)}^{-1}}{2}M$
• B. $y(\alpha {)}^{-1}M$
• C. $\frac{y(\alpha {)}^{-1}}{2}M$
• D. None of these

Answer 1

The correct option is B $y(\alpha {)}^{-1}M$

We know for weak acid $\left[H^{+}\right]=C\alpha$

$C=\frac{\left[H^{+}\right]}{\alpha }=\frac{y}{\alpha }=y{\left(\alpha \right)}^{-1}$

Option (B) is correct.