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Cambridge IGCSE Combined Science practice

Paper 3 structured question: The characteristic properties of acids and bases

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The characteristic properties of acids and bases

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Paper 3Theory (Core)2 marks

Understanding the role of indicators in chemistry.

Description

Role of Indicators

Indicators are substances that change color in response to changes in pH. They are essential for determining whether a solution is acidic or alkaline.

  1. a

    Describe the effect of alkalis on litmus and methyl orange.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: The characteristic properties of acids and bases

Paper 3Theory (Core)3 marks

Description

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.

  1. a

    Explain how alkalis affect indicators like litmus and methyl orange.

    Aim for approximately 3 distinct marking points.

    [3]