The ratio of dissociation constant of two weak acid HA and HB is 4 . At what molar concentration ratio the two acids will have same pH in separat solutions?

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0.25

0.5

answer is D.

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Detailed Solution

Given that, the ratio of dissociation constant of two weak acid HA and HB is 4 . So,

$\frac{{[H^{+}]}_{1}}{{[H^{+}]}_{2}} = \sqrt{\frac{k_{1} c_{1}}{k_{2} c_{2}}} \Rightarrow \frac{k_{1}}{k_{2}} = \frac{c_{2}}{c_{1}}; \frac{c_{1}}{c_{2}} = 0.25$

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