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Learning objective

Explain why pH decreases when an alkali is neutralised by an acid.

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Topic

Reactions of acids

Subtopic

The pH scale and neutralisation

Aqa Gcse ChemistryChemical changes

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Quick explanation

Explain why pH decreases when an alkali is neutralised by an acid

  • This point belongs to Reactions of acids, especially The pH scale and neutralisation.
  • You need to be able to explain why pH decreases when an alkali is neutralised by an acid.
  • The key ideas to know are alkali, acid, and pH.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

alkaliacidpHneutral

Why it matters

This objective helps connect The pH scale and neutralisation to exam-style questions, flashcards, and revision notes for Reactions of acids.

Quick student answer

How do you explain pH decreases when an alkali is neutralised by an acid?

Direct answer

In Chemistry, this page helps you answer questions about pH decreases when an alkali is neutralised by an acid within Reactions of acids. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are pH and neutralisation.

Key terms

  • pH: A measure of the acidity or alkalinity of a solution, where lower values indicate higher acidity.
  • neutralisation: The chemical reaction between an acid and a base or alkali, resulting in the formation of water and a salt.

Common trap

Misunderstanding pH Changes: Emphasize that pH decreases gradually as the alkali neutralises the acid, and explain the role of hydrogen ions reacting with hydroxide ions.

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Question 1

For The pH scale and neutralisation, which exam wording answer best supports this Unit 4.4 objective: Explain why pH decreases when an alkali is neutralised by an acid?

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