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Acids and Alkalis – Lesson & Practical

Edexcel IGCSE Chemistry | Unit 2.28–2.30 | Lesson

Overview

This lesson introduces acids, alkalis, and the pH scale, alongside a practical activity using common indicators and universal indicator to classify solutions. Students learn to distinguish between strong and weak acids and alkalis, and accurately determine pH values using observation and comparison.

Specification Covered

• 2.28: Describe the use of litmus, phenolphthalein and methyl orange to distinguish between acids and alkalis
• 2.29: Understand how the pH scale can be used to classify solutions
• 2.30: Describe the use of universal indicator to measure approximate pH

What’s Included

• Editable PowerPoint Lesson (Theory + Practical + Tasks)
• Student Worksheet
• Practical guide for pH testing with indicators
• Analysis questions and classification task

Features

• Fully aligned with Edexcel IGCSE Chemistry Unit 2
• Clear, student-friendly definitions and colour comparisons
• Practical allows classification of real solutions using indicators
• Promotes observational skills and correct pH interpretation
• Consistent Synapse Science layout for smooth delivery