Scripps Laboratories

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

Technical Info

Reagent / Buffer
Data