In Search of Solutions: Making your own indicator

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In Search of Solutions: Use dyes to create a reliable indicator. Linking to topics on acids/alkalis and indicators.

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Making your own indicator
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Level

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Specification

England
- GCSE
Scotland
- National 5
  - SQA Chemistry
    - Chemical changes and structure
      - Acids and bases
        pH
        The pH scale is an indication of the hydrogen ion concentration and runs from below 0 to above 14.
        Neutralisation reactions
        In an acid-base titration, the concentration of the acid or base is determined by accurately measuring the volumes used in the neutralisation reaction. An indicator can be added to show the end-point of the reaction
- Advanced Higher
  - SQA Chemistry
    - Inorganic and Physical Chemistry
      - Chemical equilibrium
        Indicators
        Indicators are weak acids for which the dissociation can be represented as: HIn(aq) + H₂O(l) ⇌ H₃O⁺(aq) + In⁻(aq)
Northern Ireland
- GCSE
  - CCEA Chemistry
    - Unit 1: Structures, Trends, Chemical Reactions, Quantitative Chemistry and Analysis
      - 1.8 Acids, bases and salts: Indicators and pH
        1.8.1 recall the colours of phenolphthalein and methyl orange in acidic, alkaline and neutral solutions;
Republic of Ireland
- Junior Cycle
  - Science
    - Chemical world
      - Systems and interactions
        8. Investigate reactions between acids and bases; use indicators and the pH scale
- Leaving Certificate
  - Chemistry
    - 4. Volumetric analysis
      - 4.2 Acids and Bases
        Depth of treatment
        Acids, bases and salts. Neutralisation - formation of a salt from an acid and a base.
    - 9. Environmental chemistry: water
      - 9.1 pH Scale
        Depth of treatment
        Choice of indicator.

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