_ 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 |
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