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 pH INDICATORS CHART 

Gray blocks indicate approximate pH range where the indicator is changing color.

Indicator                                      0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10. 11. 12. 13. 14. Preparation                       
Methyl Violet 0.0-1.6                                              .01-.05% in water
Crystal Violet 0.0-1.8                                              .02% in water
Ethyl Violet 0.0-2.4                                              .1g 50% methanol/water
Malachite Green 0.2-1.8                               water
Methyl Green 0.2-1.8                                   .1% in water
Cresol Red .04-1.8                                   ammonia/water
Thymol Blue 1.2-2.8                               ammonia/water
Bromophenol Blue 3.0-4.6                               ammonia/water
Congo Red 3.0-5.0                               .1% in water
Methyl Orange 3.2-4.4                               .01% in water
Resorcin Blue 4.4-6.2                               .2% ethanol
Alzarin Red S 4.6-6.0                               water
Methyl Red 4.8-6.0                               ethanol/water
Litmus 5.0-8.0                               water
Bromoceresol Purple 5.2-6.8                               ammonia/water
Chrophenol Red 5.2-6.8                               ammonia/water
Bromothymol Blue 6.0-7.6                               ammonia/water
Phenol Red 6.6-8.0                               ammonia/water
Neutral Red 6.8-8.0                               ethanol/water
Tumaric Curcumin 7.4-8.6                               ethanol
Phenolphthalein 8.2-10.0                             ethanol/water
Thymophthalein 9.4-10.6                               ethanol/water
Alzarin Yellow R 10.1-12.0                               .01% in water
Clayton Yellow 12.2-13.2                               .1% in water

 

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