Question 2 Consider the following Ka values; KaICH3COOH (aq) 1.80 x 105 Ka(CH2CI

Question

Question 2 Consider the following Ka values; KaICH3COOH (aq) 1.80 x 105 Ka(CH2CICOOH (aq)] 1.40 x10-3 acetic acid chioroacetic acid hypochlorous acid KaIHCIO (aq)l 2.90 x 10- hydrofluoric acid formic acid Which of the following is an incorrect statement? KJHF (aq)] = 6.30 x 10-4 Ka[HCOOH (aq)] = 1.80 x 10-4 O Hypochlorous acid is the weakest acid listed Formic acid is a weaker acid than hydrofluoric acid Hypochlorous acid is the strongest acid on the list Formic acid is a stronger acid than acetic acid O Chloroacetic acid is the strongest acid on the list

Explanation / Answer

Ka reflects the strength of the acid. if Ka is more than the strength of that particular acid also more. Ka indicates the dissociation of an acid towards right side which is the formation of its respective ions.

HA <----------> H+ + A-

First let us write the all the acids from more acidic to less acidic based on Ka

Chloroacetic acid ( 1.40x10-3) > hydrofluoric acid (6.30x10-4) > formic acid (1.80x10-3) > acetic acid (1.8x10-5) > hypochlorous acid ( 2.90x10-8) .

Therefore, the third option hypochlorous acid is the strongest in the list is the wrong answer.

Thanks.

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