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Question

If the concentrations of two weak acids are different and degrees of ionisation $$\left (\alpha \right )$$ are very less, then their relative strengths can be compared by:


A
[H+]1[H+]2
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B
α1α2
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C
C1α21C2α22
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D
Ka1C1Ka2C2
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Solution

The correct options are
A $$\displaystyle \frac{\left [ H^{+} \right ]_{1}}{\left [ H^{+} \right ]_{2}}$$
C $$\displaystyle \frac{C_{1}\alpha _{1}^{2}}{C_{2}\alpha _{2}^{2}}$$
As we know, for acids, higher the dissociation, the higher is the hydrogen ion concentrations and acid will be stronger.
So, their strength can be compare by $$\displaystyle \dfrac{\left [ H^{+} \right ]_{1}}{\left [ H^{+} \right ]_{2}}$$
Also, we can compare their strength by their dissociation constants. Higher is the constant value, stronger is the acid for a weak acid. $$K_a = C\alpha ^2$$
So, we can compare their strength by $$\dfrac{K_{a1}}{K_{a2} }= \displaystyle \frac{C_{1}\alpha _{1}^{2}}{C_{2}\alpha _{2}^{2}}$$.

Chemistry

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