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Which of the following acids has the lowest pKa value?

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+1 vote
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in Biochemistry by (89.2k points)
Which of the following acids has the lowest pKa value?

(a) Acetic acid

(b) Sulphuric acid

(c) Dil.HCl

(d) Oxalic acid

This question was addressed to me in a job interview.

Origin of the question is Ionization of Water, Weak acids and Weak Bases topic in section Water Basics of Biochemistry

1 Answer

+1 vote
by (789k points)
Right choice is (b) Sulphuric acid

To explain: The stronger the acid, the lower its pKa. Sulphuric acid is the strongest acid of all the other acids mentioned, so its pKa is the least.

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