In Search of Solutions: Indicator puzzle

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In Search of Solutions: Extract colours from plants and use them as chemical indicators. Linking to topics on buffers, acids/alkalis and indicators.

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Indicator puzzle
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Level

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Specification

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
    - 9. Environmental chemistry: water
      - 9.1 pH Scale
        Depth of treatment
        pH scale. Use of universal indicator paper or solution. Limitations of the pH scale - usefulness confined to dilute aqueous solutions.
        Choice of indicator.
Scotland
- 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)
- 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
Wales
- GCSE
  - WJEC Combined science
    - Unit 5: Chemistry 2
      - 5.2 ACIDS, BASES AND SALTS
        (a) substances as acidic, alkaline or neutral in terms of the pH scale, including acid/alkali strength
  - WJEC Chemistry
    - Unit 2: CHEMICAL BONDING, APPLICATION OF CHEMICAL REACTIONS and ORGANIC CHEMISTRY
      - 2.2 ACIDS, BASES AND SALTS
        (a) substances as acidic, alkaline or neutral in terms of the pH scale, including acid/alkali strength

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