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Paper 3Theory (Core)3 marks
Indicators are used to determine the pH of solutions.
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Indicators and pH
Indicators such as litmus and methyl orange are commonly used to test the acidity or basicity of solutions. Litmus paper turns blue in alkaline solutions, while methyl orange changes from red to yellow in the presence of alkalis.
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Explain how alkalis affect indicators like litmus and methyl orange.
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