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 x 10-5, 3.0 x 10- 8 and 1.8 x 10- 4, respectively. Which of the following orders of pH of 0.1 mol dm- 3 solutions of these acids is correct?

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Acetic acid > hypochlorous acid > formic acid

Hypochlorous acid > acetic acid > formic acid

Formic acid > hlpochlorous acid > acetic acid

Formic acid > acetic acid > hypochlorous acid

answer is D.

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Detailed Solution

As the acidity or Ka value increases, pH decreases, thus the order of pH value of the acids is Hypochlorous acid < Acetic acid < Formic acid 3.0×10−8) (1.74x10-5) (1.8x10-4)

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