Thymol Blue
Synonym(s):Thymol blue;Thymolsulfonphthalein
- CAS NO.：76-61-9
- Empirical Formula: C27H30O5S
- Molecular Weight: 466.59
- MDL number: MFCD00005869
- EINECS: 200-973-3
- SAFETY DATA SHEET (SDS)
- Update Date: 2025-01-27 09:38:02
What is Thymol Blue?
Chemical properties
brown to green powder or crystals
The Uses of Thymol Blue
Thymol Blue is a useful pH indicator compound. Dyes and metabolites.
The Uses of Thymol Blue
As as acid-base indicator; pH: red 1.2 to yellow 2.8; also yellow 8.0 to blue 9.6.
What are the applications of Application
Thymol Blue is a useful pH indicator compound
Biochem/physiol Actions
Thymol Blue is a pH indicator, which is yellow/orange at low pH and blue in color at high pH.
Properties of Thymol Blue
| Melting point: | 221-224 °C (dec.) (lit.) |
| Boiling point: | 539.4°C (rough estimate) |
| Density | 1.1413 (rough estimate) |
| refractive index | 1.5300 (estimate) |
| Flash point: | 36 °C |
| storage temp. | room temp |
| solubility | 0.11g/l |
| form | Solid |
| pka | Pka1:1.65(at 25℃)(PH=1.2 to 2.8) Pka2:8.9(at 25℃)(PH=8.0 to 9.6) |
| color | Dark green to dark brown |
| Odor | Characteristic odour |
| PH Range | 1.2(red)-2.8(yellow) 8(yellow)-9.6(blue) |
| Water Solubility | Soluble in alcohol and dilute alkali solutions. Insoluble in water. |
| λmax | 594nm, 376nm, 544nm, 430nm |
| Merck | 14,9400 |
| BRN | 368036 |
| Stability: | Stable. Combustible. Dust may form an explosive mixture with air. Incompatible with strong oxidizing agents. |
| Major Application | Display device, semiconductors, sensors, fuel cells, antimisting coating for glass, toys, corrosion inhibitor, multi-level alert system, correction fluid, textiles, falsification-proof security paper, packaging system, measurement of hydrogen ion concentrationin swimming pool water, humidity-indicating agent, diapers, cosmetics, biostatic materials, determine bacteria growth, psychoactive drugs, antidepressant drugs, dental impression material |
| CAS DataBase Reference | 76-61-9(CAS DataBase Reference) |
| NIST Chemistry Reference | Thymolsulfonephthalein(76-61-9) |
| EPA Substance Registry System | Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[5-methyl-2-(1-methylethyl)- (76-61-9) |
Safety information for Thymol Blue
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H225:Flammable liquids |
| Precautionary Statement Codes |
P280:Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for Thymol Blue
Thymol Blue manufacturer
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