First slide

Ionization constants of weak acids, PH of weak acids

Question

The dissociation constants of four monobasic acids HA, HX, HY and HD are respectively 6 x 10^-4, 5 x 10^-5, 3.6 x 10^-6and 7 x 10^-10. The pH values of their 0.1M solutions is

Moderate

A

HA > HX > HY > HD
B

HD > HY > HX > HA
C

All the solutions have same pH
D

HX > HD > HY > HA

Solution

P^H of a weak monobasic acids is given by,
P^H = $\frac{1}{2} [p^{K_{a}} - {logC}_{0}]$
$∴$ The concentration is same, $p^{K_{a}}$ value will decide the p^H.
Mono basic acid
$P^{K_a}$
HA 3.23
HX 4.3
HY 5.44
HD 9.2
P^H : HA < HX < HY < HD.

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