Q8Multiple choice
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 –5 –8 –4 1.74 × 10 , 3.0 × 10 and 1.8 × 10 respectively. Which of the following orders of pH of 0.1 mol dm–3 solutions of these acids is correct?
- (i)acetic acid > hypochlorous acid > formic acid
- (ii)hypochlorous acid > acetic acid > formic acid 87 Equilibrium
- (iii)formic acid > hypochlorous acid > acetic acid
- (iv)formic acid > acetic acid > hypochlorous acid
Show answer
(iv) formic acid > acetic acid > hypochlorous acid