First slide

Ionization constants of weak acids, PH of weak acids

Question

If the dissociation constants of two weak acids A & B are K₁ & K₂, then the relative strengths of A & B are given by

Easy

A

$\large \frac{{{K_1}}}{{{K_2}}}$
B

$\frac{{{K_2}}}{{{K_1}}}$
C

$\sqrt {\frac{{{K_2}}}{{{K_1}}}}$
D

$\sqrt {\frac{{{K_1}}}{{{K_2}}}}$

Solution

Strength of an acid is decided by the centration of H⁺ it furnishes.
H⁺ concentration furnished by weak acid is given as
$\left [ H^+ \right ]=C_0\alpha=\sqrt{K_aC_0}$ .
Considering concentraitons to be same,
relative strength is given as $\sqrt\frac{K_1}{K_2}$

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