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Acid-Base Indicators- Under Construction
| Indicators | Acid Color | Range | Color |
| Methyl Violet | yellow | 0.0 - 1.6 | blue |
| Malachite Green | yellow | 0.2 - 1.8 | blue-green |
| Cresol red | red | 1.0 - 2.0 | yellow |
| Thymol blue | red | 1.2 - 2.8 | yellow |
| Benzopurpurin 4B | violet | 1.2 - 3.8 | red |
| Phloxine B | colorless | 2.1 - 4.1 | pink |
| 2,4-Dinitrophenol | colorless | 2.8 - 4.0 | yellow |
| Methyl yellow (in ethanol) | red | 2.9 - 4.0 | yellow |
| Bromophenol blue | yellow | 3.0 - 4.6 | blue-violet |
| Congo Red | blue | 3.1 - 4.9 | red |
| Methyl orange | red | 3.2 - 4.4 | yellow |
| Bromocresol green | yellow | 4.0 - 5.6 | blue |
| alpha-Naphthyl red | red | 4.0 - 5.7 | yellow |
| Litmus (azolitmin) | red | 5.0 - 7.0 | blue |
| Bromocresol purple | yellow | 5.2 - 6.8 | violet |
| 4-Nitrophenol |
colorless | 5.4 - 6.6 | 5.4 - 6.6 yellow |
| Bromothymol blue | yellow | 6.0 - 7.6 | blue |
| Sodium indigosulphonate | blue | 11.4 - 13.0 | yellow |
| Orange G | yellow | 11.5 - 14 | pink |
| 2,4,6-Trinitrotoluene | colorless | 11.7 -12.8 | orange |
| ,3,5-Trinitrobenzene | colorless | 12.0- 14 | orange |
| Methyl blue | blue | 10.6 - 13.4 | pale violet |
| Malachite green hydrochloride | green blue | 10.2 - 10.5 | colorless |
| Alizarin yellow R | yellow | 10.0 - 12.0 | red |
| Thymolphthalein | colorless | 9.4 - 10.6 | blue |
| Phenol red | yellow | 6.4 - 8.0 | red |
| Brilliant yellow | yellow | 6.6 - 7.9 | orange |
| Cresol red | yellow | 7.0 - 8.0 | red |
| Metacresol purple | yellow | 7.4 - 9.0 | red |
| 2,6-Divanillyldenecyclohexanone | yellow | 7.8 - 9.4 | red |
| Thymol blue | yellow | 8.0 - 9.6 | blue |
| Ethyl bis (2,4-dinitrophenyl acetate) | colorless | 8.4 - 9.6 | blue |
| Phenolphthalein | colorless | 8.3 - 10.0 | dark pink |
Water Quality and Pathogenic Disease Laboratories
The Center for Environmental Quality at Wilkes University operates and maintains a series
of state-of-the-art water quality and drinking water testing laboratories. The facility, a non-profit/ equal
opportunity employer, is operated and managed, within the Environmental Engineering and
Earth Sciences under the auspices of the Center for Environmental Quality.
Currently, the laboratory is PADEP/EPA approved for drinking water analysis for regulated
water supplies for microbiological agents, but has the capability to conduct analysis for
macronutrients, general water quality parameters, and toxic metals.
Homeowners Get Your Water Tested
For More information about the Environmental Quality Center, please contact:
Attn: Mr.
Brian Oram, Professional Geologist (PG)
Laboratory Director
Wilkes University
Environmental Engineering and
Earth Sciences
PO Box 111
84 West South Street
Wilkes-Barre, PA 18766
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