Acid-Base Indicators Table
The colours of litmus, phenolphthalein, methyl orange and universal indicator in acidic, neutral and alkaline media.
| Indicator | Acidic | Neutral | Alkaline |
|---|---|---|---|
| Litmus | red | violet | blue |
| Phenolphthalein | colourless | colourless | crimson |
| Methyl orange | red | orange | yellow |
| Universal indicator | red | yellow-green | blue |
An indicator changes colour depending on the medium of a solution. Phenolphthalein only detects alkali: it stays colourless in both acidic and neutral media.
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