Using the natural pH indicator of red cabbage juice, groups determine the pH of different everyday liquids. As they work, pupils gain an understanding of pH that may help deal with contaminants in the water supply. 

Concepts

acidity, acids, acids and bases, bases, indicators, water quality, chemical properties, technology resources

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Instructional Ideas

• Brainstorm items around the house that would have a similar pH to the test liquids
• Experiment with combining the liquids to see if paarticipants can achieve a neutral pH 

Classroom Considerations

• While working around the acids and bases, be sure the pupils use lab safety procedures
• The sixth part in a series of nine 

Pros

• The resource provides suggestions to scale the activity to other grade levels
• Contains assessments to use throughout the activity

Cons

• None