Question

Which acid has a higher hydrogen ion concentration?

a) 0.050 M HNO3

c) 1.25 M HBr

Answer 1

Remember the pH scale by sorensen for the hydrogen ion concentration, pKa is the scale used to deal with the dissociation of acid. The more the dissociation, the stronger the acid. This means, lower the number, the more acidic the acid. pKa data can be found here

http://www.ochemonline.com/PKa_data

HNO₃ pKa = -1.3

HBr    pKa = -9.0

Hence HBr is strongest acid than HNO₃.

[H⁺] = 0.05 for HNO₃ and [H⁺] = 1.25 for HBr    here [H⁺] represents hydrogen ion concentration.

Answer: c) 1.25 M HBr

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