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Red Cabbage pH Indicator Lab

Make a natural pH indicator from red cabbage and use its colors to rank everyday liquids from acid to base.

Grade 9ExperimentScience OlympiadScienceChemistryData AnalysisIntermediate60 to 90 min11 materialsAdult supervision required

What you'll learn

  • Explain what pH measures and how an indicator shows it
  • Rank liquids from most acidic to most basic using evidence
  • Explain why the pH scale is logarithmic and what a change of 1 means

Objective

Prepare a natural indicator, test household liquids, and rank them by acidity using the pH scale.

STEM concepts

Acids and basespH scaleIndicatorsConcentrationControlled experiments
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Step-by-step instructions
Prediction, test sheet and results
Why does it work, challenge and project report

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