Home »Speciality Dyes and Biological Stains » Thymol Blue
What is Thymol Blue
Thymol blue, also known as thymolsulfonphthalein, is a type of sulfomephthalein dye. It is a crystalline powder that is brownish-green or reddish-brown in colour and is insoluble in water. However, it is soluble in alcohol and in solutions of dilute alkali.
Macsen Laboratories is the leading manufacturer & supplier of Thymol Blue with ISO certification.
| PRODUCT SPECIFICATIONS | |
|---|---|
| Name of Product | Thymol Blue |
| IUPAC Name | 4-[3-(4-hydroxy-2-methyl-5-propan-2-ylphenyl)-1,1-dioxo-2,1λ6-benzoxathiol-3-yl]-5-methyl-2-propan-2-ylphenol |
| Synonyms | Thymolsulfonephthalein; Thymolsulfophthalein; Sodium thymol blue; Azul Timol; Timolo blu; Thymol Bleu; Thymolblau |
| CAS No | 76-61-9 |
| Molecular Formula | C27H30O5S |
| Molecular Weight | 466.6 g/mol |
| Pubchem CID | 65565 |
| Pubchem SID | 469688484 |
Chemical Properties
| SR. No | Criteria | Limit/Specification |
|---|---|---|
| 1 | Appearance (Form) | Solid powder |
| 2 | Appearance (Color) | Brownish-Green crystals |
| 3 | Melting point | 221-224 °C (dec.) (lit.) |
| 4 | Density | 0.979 g/cm3 |
| 5 | Solubility | Insoluble in water; Gives clear solution in 0.1% ethanol; |
| 6 | UV-vis (λmax) | 594 nm (1st) 376 nm (2nd) |
| 7 | Storage temp. | Room temp. |
Uses
- Thymol Blue is useful as a pH indicator. It changes it’s colour from red to yellow at a pH range of 1.2–2.8, and then from yellow to blue at a pH range of 8.0–9.6, thus been used for the in situ spectrophotometric pH measurement.
- It is also included as a component of the Universal indicator.
- It also finds some applications in the field of hematology and histology.
FAQs
Q. What is the purpose of Thymol Blue?
Thymol Blue is used as a pH indicator to detect the acidity or basicity of solutions.
Q. Is Thymol blue the same as Bromothymol blue?
Bromothymol blue is produced by adding elemental bromine to Thymol blue in glacial acetic acid solution.
Q. How does thymol blue indicator works?
An aqueous solution of thymol blue undergoes the color changes from red to yellow in an acid solution (pKa ≈ 1.6) and from yellow to blue in an alkaline solution (pKa ≈ 8.9), thus functioning as a pH indicator.
Q. What colour is thymol blue in neutral?
Thymol Blue exhibits yellow colour in neutral form. A solution of thymol blue also shows red colour and blue colour (in basic form).
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