Thymol blue

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Thymol blue
Names
IUPAC name
3,3-Bis[4-hydroxy-2-methyl-5-(propan-2-yl)phenyl]-2,1λ6-benzoxathiole-1,1(3H)-dione
Other names
α-Hydroxy-α,α-bis(5-hydroxycarvacryl)-o-toluenesulfonic acid γ-sultone
Thymolsulfonephthalein
Properties
C27H30O5S
Molar mass 466.59 g/mol
Appearance Brownish-green crystalline powder
Density 0.979 g/cm3
Melting point 221–224 °C (430–435 °F; 494–497 K)
Boiling point Decomposes
0.011 g/100 ml (25 °C)
Solubility Soluble in alcohols
Vapor pressure ~0 mmHg
Hazards
Safety data sheet Sigma-Aldrich
Related compounds
Related compounds
Bromothymol blue
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Thymol blue, also called thymolsulfonephthalein, is an organic chemical compound, used as a pH indicator.

Properties

Chemical

It transitions from red to yellow at pH 1.2–2.8 and from yellow to blue at pH 8.0–9.6.

Physical

Thymol blue is a brownish-green or reddish-brown crystalline powder. It is insoluble in water but soluble in alcohol and dilute alkali solutions.

Availability

Can be bought from chemical suppliers.

Preparation

Thymol blue can be prepared by reacting saccharin with thymol.

Projects

Handling

Safety

Thymol blue doesn't appear to be harmful, though there is little data regarding its toxicity.

Storage

In closed airtight containers.

Disposal

No special disposal is require. May be diluted and poured down the drain or dumped in trash.

Alternatively, it may be destroyed with a strong oxidizing solution, under strong UV light.

References

Relevant Sciencemadness threads