Acidity and Alkalinity

Since their earliest chemistry lessons, students will have been familiar with acids and indicators. In GCSE Chemistry these ideas are extended to understanding some of the differences between weak and strong acids and this page contains resources to support this.

There are also materials that will help students to understand the contributions made by Arrhenius, Lowry and BrØnsted to the understanding of acid–base behaviour and resources to support acid–base titrations.

There are very close links between titrations and the material in the Amounts, Equations and Moles section.

Specification links: AQA C13.2, Edexcel 360 C3.3, OCR Gateway C5, OCR 21st Century Science C7.3, WJEC C3.2.

If you cannot find what you want in the listed resources, enter keywords from your specification in the Search box on the right. Reduce the number of ‘hits’ by using inverted commas to search for phrases.

Recommended Items

  • Image of a Triple Science recommended resource.ChemLab: TitrationhtmAQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5d, OCR 21st Century C7.4, WJEC C3.2 Webpage about titrations, with explanation accompanied by photographs of the procedure. Suitable for helping...

Useful links/resources

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AQA (5) | Edexcel (5) | OCR 21st Century Science (5) | OCR Gateway (5) | WJEC (5) | Learning Resource (5) |

AQA (Showing 4 of 5 available)

  • Strong and weak acids and bases
    htm  Web page 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 An outline of the key ideas needed to explain strong and weak acids and bases. These ideas ...

  • Doc Brown: Acids, Alkalis, Salts and Neutralisation
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Website from Doc Brown about acids and alkalis. Explains pH, plus worked examples of acid/b...

  • Acids and Bases
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Web page covering acids and bases. Extends beyond GCSE higher tier chemistry. Suitable for ...

  • Acids and Alkalis
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Interactive webpage from the gcsescience.com website, with links to notes and explanations ...

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Edexcel (Showing 3 of 5 available)

  • Strong and weak acids and bases
    htm  Web page 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 An outline of the key ideas needed to explain strong and weak acids and bases. These ideas ...

  • Doc Brown: Acids, Alkalis, Salts and Neutralisation
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Website from Doc Brown about acids and alkalis. Explains pH, plus worked examples of acid/b...

  • Acids and Bases
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Web page covering acids and bases. Extends beyond GCSE higher tier chemistry. Suitable for ...

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OCR 21st Century Science (Showing 3 of 5 available)

  • Strong and weak acids and bases
    htm  Web page 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 An outline of the key ideas needed to explain strong and weak acids and bases. These ideas ...

  • Doc Brown: Acids, Alkalis, Salts and Neutralisation
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Website from Doc Brown about acids and alkalis. Explains pH, plus worked examples of acid/b...

  • Acids and Bases
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Web page covering acids and bases. Extends beyond GCSE higher tier chemistry. Suitable for ...

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OCR Gateway (Showing 3 of 5 available)

  • Strong and weak acids and bases
    htm  Web page 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 An outline of the key ideas needed to explain strong and weak acids and bases. These ideas ...

  • Doc Brown: Acids, Alkalis, Salts and Neutralisation
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Website from Doc Brown about acids and alkalis. Explains pH, plus worked examples of acid/b...

  • Acids and Bases
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Web page covering acids and bases. Extends beyond GCSE higher tier chemistry. Suitable for ...

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WJEC (Showing 3 of 5 available)

  • Strong and weak acids and bases
    htm  Web page 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 An outline of the key ideas needed to explain strong and weak acids and bases. These ideas ...

  • Doc Brown: Acids, Alkalis, Salts and Neutralisation
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Website from Doc Brown about acids and alkalis. Explains pH, plus worked examples of acid/b...

  • Acids and Bases
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Web page covering acids and bases. Extends beyond GCSE higher tier chemistry. Suitable for ...

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Learning Resource (Showing 4 of 5 available)

  • Strong and weak acids and bases
    htm  Web page 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 An outline of the key ideas needed to explain strong and weak acids and bases. These ideas ...

  • Doc Brown: Acids, Alkalis, Salts and Neutralisation
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Website from Doc Brown about acids and alkalis. Explains pH, plus worked examples of acid/b...

  • Acids and Bases
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Web page covering acids and bases. Extends beyond GCSE higher tier chemistry. Suitable for ...

  • Acids and Alkalis
    htm  Web link 
    AQA 13.2, Edexcel C3 3.17, 3.18 and 3.19, OCR Gateway C5g and C5d, OCR 21st Century C7.3 and C7.4, WJEC C3.2 Interactive webpage from the gcsescience.com website, with links to notes and explanations ...

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