Companion PDF worksheet for Edexcel IGCSE Chemistry Lecture 21 - Acids and Alkalis. Contains short answer questions, an activity requiring lateral thinking and exam-style questions.
Specification Point 2.28 - Describe the use of litmus, phenolphthalein and methyl orange to distinguish between acidic and alkaline solutions.
Specification Point 2.29 - Understand how the pH scale can be used to classify solutions as strongly acidic, weakly acidic, neutral, weakly alkaline and strongly alkaline.
Specification Point 2.30 - Describe the use of universal indicator to measure the approximate pH value of an aqueous solution.
Specification Point 2.31 - Know that acids in aqueous solution are a source of hydrogen ions and alkalis in a aqueous solution are a source of hydroxide ions.
Specification Point 2.32 - Know that alkalis can neutralise acids.
Complete set of Chapter 5 Worksheets are available.
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