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  • Hydrolysis constants of two salts Ka and Kb of weak acids HA and HB are 10-8 and 10-6 respectively. If the dissociation constant of t

Hydrolysis constants of two salts Ka and Kb of weak acids HA and HB are 10-8 and 10-6 respectively. If the dissociation constant of third acid HC is 10-2. The order of acidic strengths of three acids are:

Option: 1

HA > HB > HC


Option: 2

HC > HA > HB


Option: 3

 HA = HB = HC


Option: 4

HB > HA > HC


Answers (1)

best_answer

We know this formula,

\begin{array}{l}\mathrm{K_{a}(H A)=\frac{K_{w}}{K_{h}}=\frac{10^{-14}}{10^{-8}}=10^{-6}} \\\\\mathrm {K_{a}(\mathrm{HB})=\frac{K_{w}}{K_{h}}=\frac{10^{-14}}{10^{-6}}=10^{-8}} \\\\\mathrm {K_{a}(\mathrm{HC})=10^{-2}} \end{array}

The greater the value of dissociation constant Ka, the more is the acidic strength.

Therefore, option(2) is correct.

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chirag

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