Indicator (Chemistry)
Contents
Key Stage 3
Meaning
An indicator is a dye that changes colour when other chemicals are present.
About Indicators
Some non-pH indicators you should know:
- Iodine Solution - Used to detect starch.
- Biuret Solution - Used to detect proteins.
- Benedict's Solution - Used to detect simple sugars like glucose.
- Limewater - Used to detect Carbon Dioxide.
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 indicator can be added to solution without affecting the pH of the solution. If an indicator change 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
An indicator is a dye that changes colour when other chemicals are present.
About Indicators
Some non-pH indicators you should know:
- Iodine Solution - Used to detect starch.
- Biuret Solution - Used to detect proteins.
- Benedict's Solution - Used to detect simple sugars like glucose.
- Limewater - Used to detect Carbon Dioxide.
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 indicator can be added to solution without affecting the pH of the solution. If an indicator change 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
|
References
Edexcel
- Indicators (pH) page 52, GCSE Chemistry, Pearson, Edexcel
- Indicators (pH), page 196, GCSE Combined Science, Pearson Edexcel
- Indicators, page 43, 65, 110, GCSE Chemistry; The Revision Guide, CGP, Edexcel
- Indicators, pages 105, 209, GCSE Combined Science; The Revision Guide, CGP, Edexcel
- Indicators, pages 118-120, 131, 132, 185, 186, 205, 323, GCSE Chemistry, CGP, Edexcel