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  • Equilibrium and Acid Reactions
    • Static and Dynamic Equilibrium
    • Factors That Affect Equilibrium
    • Calculating The Equilibrium Constant Keq
    • Solution Equilibria
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    • Properties of Acids and Bases
    • Using Brønsted–Lowry Theory
    • Quantitative Analysis
  • Organic Chemistry
    • Nomenclature
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      • 1. Fossil Fuel Products
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      • 1. Indicators
      • 2. Acidic Oxides
      • 3. Acids
      • 4. Acid/Base Definitions
      • 5. Esterification
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      • 2. Maximising Production
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  • Current Syllabus:
  • Equilibrium and Acid Reactions
    • Static and Dynamic Equilibrium
    • Factors That Affect Equilibrium
    • Calculating The Equilibrium Constant Keq
    • Solution Equilibria
  • Acid/Base Reactions
    • Properties of Acids and Bases
    • Using Brønsted–Lowry Theory
    • Quantitative Analysis
  • Organic Chemistry
    • Nomenclature
    • Hydrocarbons
    • Products of Reactions Involving Hydrocarbons
    • Alcohols
    • Reactions of Organic Acids and Bases
    • Polymers
  • Applying Chemical Ideas
    • Analysis of Inorganic Substances
    • Analysis of Organic Substances
    • Chemical Synthesis and Design
  • Pre-2019 Syllabus:
    • Production of Materials
      • 1. Fossil Fuel Products
      • 2. Biomass Research
      • 3. Renewable Ethanol
      • 4. Electrochemical Methods
      • 5. Nuclear Methods
    • The Acidic Environment
      • 1. Indicators
      • 2. Acidic Oxides
      • 3. Acids
      • 4. Acid/Base Definitions
      • 5. Esterification
    • Monitoring and Management
      • 1. Chemists and Reactions
      • 2. Maximising Production
      • 3. Manufactured Products
      • 4. The Atmosphere
      • 5. Water
    • Elective Units
      • Industrial Chemistry
      • Shipwrecks and Salvage
      • The Biochemistry of Movement
      • The Chemistry of Art
      • Forensic Chemistry
  • Other Subjects:
  • EasyPhys – HSC Physics
  • EasyHSC – Business Studies
  • EasyHSC – HSC Biology
  • Products
  • Search

Indicators

The Acidic Environment‎ > ‎

Indicators were identified with the observation that the colour of some flowers depends on soil composition

Students learn to:

  • classify common substances as acidic, basic or neutral
  • identify that indicators such as litmus, phenolphthalein, methyl orange and bromothymol blue can be used to determine the acidic or basic nature of a material over a range, and that the range is identified by change in indicator colour
  • identify and describe some everyday uses of indicators including the testing of soil acidity/basicity

Students:

  • perform a first-hand investigation to prepare and test a natural indicator
  • identify data and choose resources to gather information about the colour changes of a range of indicators
  • solve problems by applying information about the colour changes of indicators to classify some household substances as acidic, neutral or basic

Extract from Chemistry Stage 6 Syllabus (Amended October 2002). © 2009, Board of Studies NSW.

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