pH transition ranges and colors of phenolphthalein, methyl orange, methyl red and bromothymol blue.
| Indicator | Transition range (pH) | Acid → basic color |
|---|---|---|
| Phenolphthalein | 8.2 – 10 | — |
| Methyl orange | 3.1 – 4.4 | — |
| Methyl red | 4.4 – 6.2 | — |
| Bromothymol blue | 6 – 7.6 | — |
The ranges used by the «Titration» tool; the right indicator is the one that changes inside the pH jump at the equivalence point.
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