First slide

Ionization constants of weak acids, PH of weak acids

Question

Statement 1 : Acids that have more than one proton that can be donated to base are called polyprotic acids.
Statement 2 : For all diprotic acids, the equilibrium constant $K_{a_{2}},$ for the second stage of ionisation is smaller than the equilibrium constant, $K_{a_{1}},$ for the first stage of ionisation.

Easy

A

Both statements I and II are correct.
B

Statement I is correct and statement II is incorrect.
C

Statement I is incorrect and statement II is correct.
D

Both statements I and II are incorrect.

Solution

A polyprotic acid is a compound which may lose more than 1 proton. The constant for dissociation of the first proton may be denoted as $K_{a_{1}}$ and the constants for dissociation of successive protons as $K_{a_{2}}$ , etc. Phosphoric acid, H₃PO₄, is an example of a polyprotic acid as it can lose three protons.
In polyprotic acids, $K_{a_{1}} > K_{a_{2}} > K_{a_{3}} > . . .$

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