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
B
α1α2
C
C1α21C2α22
D
Ka1C1Ka2C2

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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