pH Indicators
| Indicator |
pH Range |
Color in Acid |
Color in Alkali |
|
| Thymol Blue (acid) |
1.2 - 2.8 |
Red |
Yellow |
| Methyl Orange |
3.1 - 4.4 |
Red |
Yellow |
| Bromcresol Green |
3.8 - 5.4 |
Yellow |
Blue |
| Methyl Red |
4.3 - 6.3 |
Red |
Yellow |
| Litmus |
5.0 - 8.0 |
Red |
Blue |
| Bromcresol Purple |
5.2 - 6.8 |
Yellow |
Purple |
| Bromthymol Blue |
6.0 - 7.6 |
Yellow |
Blue |
| Neutral Red |
6.8 - 8.0 |
Red |
Orange |
| Phenol Red |
6.8 - 8.4 |
Yellow |
Red |
| Cresol Blue (base) |
7.2 - 8.8 |
Yellow |
Red |
| Thymol Blue (base) |
8.0 - 9.6 |
Yellow |
Blue |
| Phenolphthalein |
7.2 - 10.0 |
Colorless |
Red |
