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Learning objective

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

Read the explanation, check the common trap, then practise with flashcards and questions.

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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 increases when an acid is neutralised by an alkali

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

Key concepts

alkaliacidneutralpH

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 increases when an acid is neutralised by an alkali?

Direct answer

In Chemistry, this page helps you answer questions about pH increases when an acid is neutralised by an alkali 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, on a scale from 0 to 14. In The pH scale and neutralisation, this term helps explain explain why pH increases when an acid is neutralised by an alkali for AQA GCSE Chemistry 8462 Unit 4.4.
  • neutralisation: The chemical reaction between an acid and a base or alkali, resulting in the formation of salt and water.

Common trap

Misinterpreting pH change as a direct ion count: Explain that pH is calculated from the negative log of the H⁺ concentration; when an alkali supplies OH⁻, the H⁺ concentration falls exponentially, so the pH rises by a number of units that depends on the amount of OH⁻ added and the initial H⁺ concentration, not by a fixed amount.

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Question 1

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

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