Thymol Blue Chemical Properties

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

PH Range

1.2(red)-2.8(yellow) 8(yellow)-9.6(blue)

Odor

Characteristic odour

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

Risk Statements 

10

Safety Statements 

24/25

RIDADR 

UN 1170 3/PG 3

WGK Germany 

3

RTECS 

XP2575000

TSCA 

Yes

HS Code 

2934 99 90

PackingGroup 

II

MSDS

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Thymol Blue Usage And Synthesis

Chemical Properties

brown to green powder or crystals

Uses

Thymol Blue is a useful pH indicator compound. Dyes and metabolites.

Uses

As as acid-base indicator; pH: red 1.2 to yellow 2.8; also yellow 8.0 to blue 9.6.

Biochem/physiol Actions

Thymol Blue is a pH indicator, which is yellow/orange at low pH and blue in color at high pH.

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