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These resources have been reviewed and selected by STEM Learning’s team of education specialists for factual accuracy and relevance to teaching STEM subjects in UK schools.
Make Your Own Indicator
This Catalyst article describes how an indicator changes colour when in solutions of different pH. Most indicators simply turn one colour in acid and another in alkali, although they are often an in-between colour when neutral. A universal indicator only turns as many colours as it does because it is a mixture of several different indicator substances. The article describes how to extract natural indicators using readily available plants.
This article is from Catalyst: GCSE Science Review 2009, Volume 20, Issue 1.
Catalyst is a science magazine for students aged 14-19 years. Annual subscriptions to print copies of the magazine can be purchased from Mindsets.
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