Contents
Key Stage 3
Meaning
A pH Indicator is a dye which changes colour depending on the pH of its environment.
About pH Indicators
- The colour of a pH indicator can be used to tell the pH of a solution.
- Different indicators will have a different range of colours for different pH values.
- A good pH indicator can be added to solution without affecting the pH of the solution. If a pH indicator changed the pH of a solution it could not give an accurate reading.
Some pH indicators you should know:
- Litmus Paper
- Red Cabbage Indicator
- Universal Indicator
- Phenolphthalein
- Methyl Orange
- Bromothymol Blue
Examples
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Key Stage 4
Meaning
A pH indicator is a dye which changes colour depending on the concentration of H+ or OH- ions in solution.
About pH Indicators
- pH indicators are used to determine the pH of a solution.
- Different pH indicators have a different range of effectiveness. Some only have two colours and change between them at a very specific pH. Others can have many different colours over a range of pH values.
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