Taber's Medical Dictionary
indicator
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(in″dĭ-kāt′ŏr )
[L. indicare, to show]
In chemical analysis, a substance that can be used to determine pH. In a more general sense, any substance that can be used to determine the completeness of a chemical reaction, as in volumetric analysis. SEE TABLE: Colors of Indicators of pH
Colors of Indicators of pH
| Color | |||
| Toward Acid | Toward Alkali | Range of pH | |
| Methyl yellow | Red | Yellow | 2.9-4.0 |
| Congo red | Blue | Red | 3.0-5.2 |
| Methyl orange | Red | Yellow | 3.1-4.4 |
| Methyl red | Red | Yellow | 4.2-6.2 |
| Litmus | Red | Blue | 4.5-8.3 |
| Bromcresol purple | Yellow | Purple | 5.2-6.8 |
| Bromothymol blue | Yellow | Blue | 6.0-7.6 |
| Phenol red | Yellow | Red | 6.8-8.4 |
| Phenolphthalein | Colorless | Pink | 8.2-10.0 |
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(in″dĭ-kāt′ŏr )
[L. indicare, to show]
In chemical analysis, a substance that can be used to determine pH. In a more general sense, any substance that can be used to determine the completeness of a chemical reaction, as in volumetric analysis. SEE TABLE: Colors of Indicators of pH
Colors of Indicators of pH
| Color | |||
| Toward Acid | Toward Alkali | Range of pH | |
| Methyl yellow | Red | Yellow | 2.9-4.0 |
| Congo red | Blue | Red | 3.0-5.2 |
| Methyl orange | Red | Yellow | 3.1-4.4 |
| Methyl red | Red | Yellow | 4.2-6.2 |
| Litmus | Red | Blue | 4.5-8.3 |
| Bromcresol purple | Yellow | Purple | 5.2-6.8 |
| Bromothymol blue | Yellow | Blue | 6.0-7.6 |
| Phenol red | Yellow | Red | 6.8-8.4 |
| Phenolphthalein | Colorless | Pink | 8.2-10.0 |
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