Question

The pH of 0.1 M solution of a weak monoprotic acid 1% ionised is …

(a) 1 

(b) 2

(c) 3 

(d) 4

Answer 1

(c) 3

Conc = 0.1 M

α = 1

= 0.1 x \(\frac{1}{100}\) = 10^-3

[H⁺] = 10^-3 

∴ pH = 3