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HSC Chemistry

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2 | Acidic environment

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

Lesson 1 | Indicators and classification of substances

  • 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 data and choose resources to gather information about the colour changes of a range of indicators

  • Classify common substances as acidic, basic or neutral

Lesson 2 | Preparing and testing a natural indicator

  • Perform a first-hand investigation to prepare and test a natural indicator

Lesson 3 | Testing a variety of substances

  • Identify and describe some everyday uses of indicators including the testing of soil acidity/basicity

  • Solve problems by applying information about the colour changes of indicators to classify some household substances as acidic, neutral or basic

  • Solve problems and perform a first-hand investigation to use pH meters/probes and indicators to distinguish between acidic, basic and neutral chemicals

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