1. Tardigrade
  2. Question
  3. Chemistry
  4. The Ka values of acetic acid, hypochlorous acid and formic acid are 1.74 × 10-5, 3.0 × 10-8 and 1.8 × 10-4 respectively. Which of the following orders of mathrmpH of 0.1 mol dm-3 solutions of these acids is correct?

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Q. The $K_{a}$ values of acetic acid, hypochlorous acid and formic acid are $1.74 \times 10^{-5}, 3.0 \times 10^{-8}$ and $1.8 \times 10^{-4}$ respectively. Which of the following orders of $\mathrm{pH}$ of $0.1 \, mol \,dm^{-3}$ solutions of these acids is correct?

Equilibrium

Solution:

Greater is the ionisation constant, greater is the strength of the acid. Formic acid > Acetic acid > Hypochlorous acid