Product Notes
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General Acid-Base Indicators
| Indicator | pH Range | Quantity per 10 ml | Acid | Base |
| Thymol Blue | 1.2-2.8 | 1-2 drops 0.1% soln. in aq. | red | yellow |
| Pentamethoxy red | 1.2-2.3 | 1 drop 0.1% soln. in 70% alc. | red-violet | colorless |
| Tropeolin OO | 1.3-3.2 | 1 drop 1% aq. soln. | red | yellow |
| 2,4-Dinitrophenol | 2.4-4.0 | 1-2 drops 0.1% soln. in 50% alc. | colorless | yellow |
| Methyl yellow | 2.9-4.0 | 1 drop 0.1% soln. in 90% alc. | red | yellow |
| Methyl orange | 3.1-4.4 | 1 drop 0.1% aq. soln. | red | orange |
| Bromphenol blue | 3.0-4.6 | 1 drop 0.1% aq. soln. | yellow | blue-violet |
| Tetrabromphenol blue | 3.0-4.6 | 1 drop 0.1% aq. soln. | yellow | blue |
| Alizarin sodium sulfonate | 3.7-5.2 | 1 drop 0.1% aq. soln. | yellow | violet |
| α-Naphthyl red | 3.7-5.0 | 1 drop 0.1% soln. in 70% alc. | red | yellow |
| p-Ethoxychrysoidine | 3.5-5.5 | 1 drop 0.1% aq. soln. | red | yellow |
| Bromcresol green | 4.0-5.6 | 1 drop 0.1% aq. soln. | yellow | blue |
| Methyl red | 4.4-6.2 | 1 drop 0.1% aq. soln. | red | yellow |
| Bromcresol purple | 5.2-6.8 | 1 drop 0.1% aq. soln. | yellow | purple |
| Chlorphenol red | 5.4-6.8 | 1 drop 0.1% aq. soln. | yellow | red |
| Bromphenol blue | 6.2-7.6 | 1 drop 0.1% aq. soln. | yellow | blue |
| p-Nitrophenol | 5.0-7.0 | 1-5 drops 0.1% aq. soln. | colorless | yellow |
| Azolitmin | 5.0-8.0 | 5 drops 0.5% aq. soln. | red | blue |
| Phenol red | 6.4-8.0 | 1 drop 0.1% aq. soln. | yellow | red |
| Neutral red | 6.8-8.0 | 1 drop 0.1% soln. in 70% alc. | red | yellow |
| Rosolic acid | 6.8-8.0 | 1 drop 0.1% soln. in 90% alc. | yellow | red |
| Cresol red | 7.2-8.8 | 1 drop 0.1% aq. soln. | yellow | red |
| α-Naphtholphthalein | 7.3-8.7 | 1-5 drops 0.1% soln. in 70% alc. | rose | green |
| Tropeolin OOO | 7.6-8.9 | 1 drop 0.1% aq. soln. | yellow | rose-red |
| Thymol blue | 8.0-9.6 | 1-5 drops 0.1% aq. soln. | yellow | blue |
| Phenolphthalein | 8.0-10.0 | 1-5 drops 0.1% soln. in 70% alc. | colorless | red |
| α-Naphtholbenzein | 9.0-11.0 | 1-5 drops 0.1% soln. in 90% alc. | yellow | blue |
| Thymolphthalein | 9.4-10.6 | 1 drop 0.1% soln. in 90% alc. | colorless | blue |
| Nile blue | 10.1-11.1 | 1 drop 0.1% aq. soln. | blue | red |
| Alizarin yellow | 10.0-12.0 | 1 drop 0.1% aq. soln. | yellow | lilac |
| Salicyl yellow | 10.0-12.0 | 1-5 drops 0.1% soln. in 90% alc. | yellow | orange-brown |
| Diazo violet | 10.1-12.0 | 1 drop 0.1% aq. soln. | yellow | violet |
| Tropeolin O | 11.0-13.0 | 1 drop 0.1% aq. soln. | yellow | orange-brown |
| Nitramine | 11.0-13.0 | 1-2 drops 0.1% soln in 70% alc. | colorless | orange-brown |
| Poirrier's blue | 11.0-13.0 | 1 drop 0.1% aq. soln. | blue | violet-pink |
| Trinitrobenzoic acid | 12.0-13.4 | 1 drop 0.1% aq. soln. | colorless | orange-red |
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