Question

If concentration of two acids are some, their relative strengths can be compared by:

• A. ${\alpha }_1/{\alpha }_2$
• B. $K_1/K_2$
• C. ${\left[H^{+}\right]}_1/{\left[H^{+}\right]}_2$
• D. $\sqrt{K_1/K_2}$

Answer 1

Answer: (A), (C), (D)

${\alpha }_1/{\alpha }_2$
${\left[H^{+}\right]}_1/{\left[H^{+}\right]}_2$
$\sqrt{K_1/K_2}$

Relative strength of two acids can be compared by their degree of dissociation.

$HA\rightleftharpoons H^{+}+A^{-}$

$C$

$C-C\alpha$ $C\alpha$ $C\alpha$

If concentration of two acids are same so their relative strength can be compared by their $\left[H^{+}\right]$ concentration.

$K_a=C{\alpha }^2$

$\alpha =(K_a/C{)}^{0.5}$

If concentration of two acids are same so their relative strength can be compared by square root of their dissociation constants.