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pH Indicators |
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| Indicator |
Acid Color |
Low pH |
High pH |
Base Color |
| Methyl violet |
yellow |
0.0 |
1.6 |
blue |
| Cresol red
(1st range) |
red |
0.0 |
1.8 |
yellow |
| Crystal violet |
yellow |
0.0 |
1.8 |
blue |
| Malachite green |
yellow |
0.2 |
1.8 |
blue-green |
| Methyl green |
yellow |
0.2 |
1.8 |
blue |
| Metanil yellow |
red |
1.2 |
2.4 |
yellow |
| m-Cresol purple (1st range) |
red |
1.2 |
2.8 |
yellow |
| Metacresol purple (1st range) |
red |
1.2 |
2.8 |
yellow |
| Thymol blue (1st range) |
red |
1.2 |
2.8 |
yellow |
| 4-o-Tolylazo-o-toluidine |
orange |
1.4 |
2.8 |
yellow |
| Orange IV (Tropeolin 00) |
red |
1.4 |
3.2 |
yellow |
| 2,6-Dinitrophenol |
colorless |
1.7 |
4.4 |
yellow |
| Benzyl orange |
red |
1.9 |
3.3 |
yellow |
| 2,4-Dinitrophenol |
colorless |
2.0 |
4.7 |
yellow |
| Benzopurpurine 48 |
violet |
2.2 |
4.2 |
red |
| p-Dimethylaminoazobenzene |
red |
2.9 |
4.0 |
yellow |
| Bromochlorophenol blue |
yellow |
3.0 |
4.6 |
purple |
| Bromophenol blue |
yellow |
3.0 |
4.6 |
blue |
| Congo red |
blue |
3.0 |
5.0 |
red |
| Methyl orange |
red |
3.1 |
4.4 |
yellow |
| Ethyl orange |
red |
3.4 |
4.8 |
yellow |
| Bromocresol green |
yellow |
3.8 |
5.4 |
blue |
| Resazurin |
orange |
3.8 |
6.4 |
violet |
| 2,5-Dinotrophenol |
colorless |
4.0 |
5.8 |
yellow |
| Methyl red |
red |
4.2 |
6.3 |
yellow |
| Azolitmin (litmus) |
red |
4.4 |
6.6 |
blue |
| Alizarin red S |
yellow |
4.6 |
6.0 |
red |
| Propyl red |
red |
4.6 |
6.6 |
yellow |
| Chlorophenol red |
yellow |
4.6 |
7.0 |
red |
| p-Nitrophenol |
colorless |
4.7 |
7.9 |
yellow |
| Bromophenol red |
yellow |
4.8 |
6.8 |
purple |
| Bromocresol purple |
yellow |
5.2 |
6.8 |
purple |
| p-Nitrophenol |
colorless |
5.4 |
6.6 |
yellow |
| Bromothymol blue |
yellow |
6.0 |
7.6 |
blue |
| Brilliant yellow |
yellow |
6.6 |
7.8 |
red |
| Phenol red |
yellow |
6.6 |
8.4 |
red |
| m-Nitrophenol |
colorless |
6.6 |
8.6 |
yellow |
| Neutral red |
red |
6.8 |
8.0 |
yellow |
| Rosolic acid |
brown |
6.9 |
8.0 |
red |
| Cresol red (2nd range) |
yellow |
7.0 |
8.8 |
red |
| a-Naphtholphthalein |
brown |
7.3 |
8.7 |
green |
| Metacresol purple (2nd range) |
yellow |
7.4 |
9.0 |
purple |
| m-Cresol purple (2nd range) |
yellow |
7.4 |
9.2 |
purple |
| Orange I (Tropeolin ))) No.
) |
yellow |
7.6 |
8.9 |
rose |
| Thymol blue (2nd range) |
yellow |
8.0 |
9.6 |
blue |
| Phenolphthalein |
colorless |
8.0 |
10.0 |
red |
| o-Cresolphthalein |
colorless |
8.2 |
9.8 |
red |
| Thymolphthalein |
colorless |
8.8 |
10.6 |
blue |
| Alizarin yellow GG |
yellow |
10.0 |
12.0 |
orange |
| b-Naphthol violet |
yellow |
10.0 |
12.0 |
violet |
| Alizarin yellow R |
yellow |
10.1 |
12.2 |
red |
| Nitramine |
colorless |
10.8 |
13.0 |
brown |
| Poirrier blue |
blue |
11.0 |
13.0 |
red |
| Resorcin yellow (Tropeolin
0) |
yellow |
11.1 |
12.7 |
orange |
| Benzene sulfonic acid |
yellow |
11.4 |
12.6 |
orange |
| Indigosulfonic acid |
blue |
11.4 |
13.0 |
yellow |
| Clayton yellow |
yellow |
12.2 |
13.2 |
amber |
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pH values are approximate values and have
been rounded off to the nearest tenth.
Values assume a temperature of 25 C (77 F) |
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