Universal indicator
What Universal indicator means in Combined Science GCSE, as defined for AQA.
Definitions of Universal indicator
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Reference: AQA
A mixture of dyes that changes colour gradually across the pH scale, showing whether a solution is strongly acidic, weakly acidic, neutral, weakly alkaline or strongly alkaline.
A mixture of dyes that gives a colour for each pH value, such as red for strong acids and purple for strong alkalis.
Topics that use Universal indicator
- The pH scale and neutralisation (AQA GCSE)
Related terms
- Acids
- Hydroxide ions
- Ionic reactions in solution
- Neutral solutions
- Neutralisation
- pH scale
- Representing reactions with word and symbol equations
- The pH scale
Using Universal indicator in the exam
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