What is an acid according to Bronsted-Lowry?

Questions & AnswersCategory: ChemistryWhat is an acid according to Bronsted-Lowry?
Edwin asked 11 months ago

Hello, I got this question asking for the definition of an acid according to Bronsted-Lowry. Can you guys please help me with the answer?

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Edukamer answered 11 months ago

Hello, the simple term to use when defining an acid according to the Brønsted-Lowry theory is "Proton donor".


That is, an acid according to the Brønsted-Lowry is any chemical species capable of donating a proton or hydrogen cation.

So, based on this definition, an acid and base react with each other, causing the acid to form its conjugate base and the base to form its conjugate acid by exchanging a proton.

For example, ammonia and hydrogen chloride may react to form solid ammonium chloride according to the following reaction:

NH3(g) + HCl(g) → NH4Cl(s)

In this reaction, the Bronsted-Lowry acid is HCl because it donates a hydrogen (proton) to NH3, the Bronsted-Lowry base. Because the reaction does not occur in water and because neither reactant formed H+ or OH-, this would not be an acid-base reaction according to the Arrhenius definition.

replied 11 months ago

Hello, Edukamer. Thanks very much for the quick anwer.

Written by Edwin