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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)3 marks

Understanding how indicators work is crucial in chemistry.

Description

Acid-Base Indicators

Indicators are substances that change color in response to pH changes. Litmus and methyl orange are examples of such indicators.

  1. a

    Describe the color changes of litmus and methyl orange when they are added to an acid.

    Aim for approximately 3 distinct marking points.

    [3]

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

Paper 3Theory (Core)2 marks

Description

Indicator Color Changes

Litmus paper and methyl orange are common indicators used in laboratories. Litmus paper turns red in acidic solutions and blue in basic solutions. Methyl orange turns red in acidic solutions and yellow in neutral to basic solutions.

  1. a

    Explain how litmus and methyl orange indicate the presence of acids.

    Aim for approximately 2 distinct marking points.

    [2]