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Bronsted-Lowry Base - IB Chemistry Definition

Reviewed by: Alexandra Brennan

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What is a Brønsted-Lowry base?

A Brønsted-Lowry base is a substance that can accept a proton (H⁺ ion) in a chemical reaction, according to the Brønsted-Lowry theory of acids and bases. This definition is widely used in chemistry because it extends the concept of bases beyond those that contain the hydroxide ion, thus including a broader range of compounds. For example, ammonia (NH₃) acts as a Brønsted-Lowry base when it accepts a proton to form ammonium (NH₄⁺). Understanding Brønsted-Lowry bases is essential for IB Chemistry students as it helps them grasp acid-base reactions, pH changes, and related equilibria in aqueous solutions.

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Alexandra Brennan

Reviewer: Alexandra Brennan

Expertise: Chemistry

Alex studied Biochemistry at Newcastle University before embarking upon a career in teaching. With nearly 10 years of teaching experience, Alex has had several roles including Chemistry/Science Teacher, Head of Science and Examiner for AQA and Edexcel. Alex’s passion for creating engaging content that enables students to succeed in exams drove her to pursue a career outside of the classroom at SME.

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