Question

The ionisation constant of an acid, ka, is the measure of strength of an acid. The ka values of acetic acid, hypochlorous acid and formic acid are 1.74*10^-5

Answer 1

Explanation:

K

a

is a measure of the strength of the acid i.e., larger the value of K_aK

a

, the stronger is the acid.

Thus, the correct order of acidic strength is

HCOOH > CH_3COOH > HClOHCOOH>CH

3

COOH>HClO

Stronger the acid, lesser will be the value of pH. Hence, the correct order of pH is HClO > CH_3COOH > HCOOHHClO>CH

3

COOH>HCOOH.