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Some Common pH Indicators
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| 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 |
pH is a measure of the acidity or basicity of a solution. It is defined as the cologarithm of the activity of dissolved hydrogen ions (H+). Hydrogen ion activity coefficients cannot be measured experimentally, so they are based on theoretical calculations. The pH scale is not an absolute scale; it is relative to a set of standard solutions whose pH is established by international agreement.[1] http://en.wikipedia.org/wiki/PH
pH Calculator: http://www.sensorex.com/support/education/pH_calculator.html
