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?

Question

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? (A) Formic acid > hypochlorous acid > acetic acid (B) Hypochlorous acid > acetic acid > formic acid (C) Acetic acid > hypochlorous acid > formic acid (D) Formic acid > acetic acid > hypochlorous acid

Tardigrade Admin · Accepted Answer

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

Q. 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 pH of 0.1moldm−3 solutions of these acids is correct?

Formic acid > hypochlorous acid > acetic acid

Hypochlorous acid > acetic acid > formic acid

Acetic acid > hypochlorous acid > formic acid

Formic acid > acetic acid > hypochlorous acid

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

Q. The $K_{a}$ values of acetic acid, hypochlorous acid and formic acid are $1.74 \times 1 0^{- 5}, 3.0 \times 1 0^{- 8}$ and $1.8 \times 1 0^{- 4}$ respectively. Which of the following orders of $pH$ of $0.1 m o l d m^{- 3}$ solutions of these acids is correct?