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Alkalinity - GCSE Chemistry Definition

Reviewed by: Philippa Platt

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Alkalinity refers to the capacity of a solution to neutralise acids, often measured by the presence of certain ions like carbonates, bicarbonates, and hydroxides. In the context of GCSE Chemistry, it represents the opposite of acidity and is an important concept for understanding the pH scale, where solutions with a pH greater than 7 are considered alkaline.

Alkalinity plays a crucial role in maintaining stable pH levels in natural bodies of water and everyday substances like soap and baking soda. Understanding alkalinity is essential for grasping broader chemical reactions and processes, such as neutralisation, which involves an acid reacting with a base to form water and a salt.

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Philippa Platt

Reviewer: Philippa Platt

Expertise: Chemistry Content Creator

Philippa has worked as a GCSE and A level chemistry teacher and tutor for over thirteen years. She studied chemistry and sport science at Loughborough University graduating in 2007 having also completed her PGCE in science. Throughout her time as a teacher she was incharge of a boarding house for five years and coached many teams in a variety of sports. When not producing resources with the chemistry team, Philippa enjoys being active outside with her young family and is a very keen gardener

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