Thymolblue-Phenolphthalein indicator , Indicator , 76-61-9

Synonym(s):
Thymol blue;Thymolsulfonphthalein

Update time: 2022-07-08

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)

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