Last Updated Sep 27, 2025

Food: Prescribed Experiments Simplified Revision Notes for Leaving Cert Biology

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Food: Prescribed Experiments

There are four food tests.

infoNote

Conduct a qualitative test for;

1. Starch
2. Fat
3. A reducing sugar
4. A protein

You need to know:

• How to conduct each experiment
• The chemicals and instruments involved
• The control setup used
• How to identify the outcome of a positive result
• How to draw a labelled diagram of the process, including chemicals and apparatus

Check out our full experiment notes for an in-depth breakdown of each experiment.

Chapter	Test	Chemicals/Instruments	Positive Result
Food	Starch	Iodine	Brown to blue/black
Food	Fat	Brown paper	Translucent spot
Food	Glucose (reducing sugar)	Fehling's (or Benedict's solution) + water bath at 37°C	Blue to brick red
Food	Protein (biuret)	Sodium hydroxide + copper sulphate	Blue to lilac

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