The ionisation constant of an acid, K_a is the measure of strength of an acid. The K_a values of acetic acid, hypochlorous acid and formic acid are 1.74 xx 10^(-5), 3.0 xx 10^(-8) and 1.8 xx 10^(-4) respectively. Which of the following orders of pH of 0.1 mol dm^(-3) solutions of these acids is correct ?

The ionisation constant of an acid, K_a is the measure of strength of

1.	The ionisation constant of an acid, K_a is the measure of strength of an acid. The K_a values of acetic acid, hypochlorous acid and formic acid are 1.74 xx 10^(-5), 3.0 xx 10^(-8) and 1.8 xx 10^(-4) respectively. Which of the following orders of pH of 0.1 mol dm^(-3) solutions of these acids is correct ?
Answer» ACETIC acid `GT` hypochlorous acid `gt` formic acid hypochlorous acid `gt` acetic acid `gt` formic acid formic acid `gt` hypochlorous acid `gt` acetic acid formic acid `gt` acetic acid `gt` hypochlorous acid Solution : If the acidity or `K_a` value increases, pH decreases, HENCE LIKE this, the ORDER of pH value of the acids is, `{:("Hypochlorous acid",lt,"Acetic acid",lt , "Formic acid"),((3.8xx10^(-8)),,(1.74xx10^(-5)),,(18xx10^(-4))):}`