Thymolphthalein Chemical Properties

Melting point:

251-253 °C(lit.)

Boiling point:

504.79°C (rough estimate)

Density 

0.92 g/mL at 25 °C

vapor pressure 

0.002Pa at 90℃

refractive index 

1.6400 (estimate)

Flash point:

74 °F

storage temp. 

no restrictions.

solubility 

ethanol: clarity passes test

form 

Low Melting Mass

pka

9.70, 10.0(at 25℃)

color 

White to slightly yellow

Specific Gravity

0.92

PH

8.6～10.5

PH Range

9.3(colourless)-10.5(blue)

Odor

Mild characteristic odor

explosive limit

3.30-19%

Water Solubility 

insoluble

λmax

592nm, 396nm, 598nm

Merck 

14,9401

BRN 

359413

Major Application

Display device, semiconductors, recording materials, photoconductors, sol-gel matrix, tin electroplating process, counterfeit-proof paper, authentication system forsecure documents, inks, pencil leads, correction fluid, paints, petroleum marker, tennis ball, adhesives, floor coatings, textiles, detergents, insecticide, lotion, cleaning pads, food storage, determine bacterial growth, Streptococci in saliva, dental impressionmaterials

InChIKey

GRBHJPCWQRVGND-UHFFFAOYSA-N

LogP

3.682 at 25℃

CAS DataBase Reference

125-20-2(CAS DataBase Reference)

EPA Substance Registry System

Thymolphthalein (125-20-2)

Safety Information

Hazard Codes 

F,Xn

Risk Statements 

11-40-10

Safety Statements 

7-16-36/37-24/25-22

RIDADR 

UN 1170 3/PG 3

WGK Germany 

3

TSCA 

Yes

HazardClass 

3

PackingGroup 

II

HS Code 

29322980

MSDS

• Language:English Provider:Thymolphthalein
• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
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Thymolphthalein Usage And Synthesis

Chemical Properties

white fine crystalline powder

Uses

Thymolphthalein is a pH sensitive dye that has multiple uses such as testing hydration and/or saliva testing.

Uses

As pH indicator: colorless 9.3 to blue 10.5. Also as reagent for blood after decolorizing the alkaline solution by boiling with zinc dust.

Definition

ChEBI: Thymophthalein is a terpene lactone.

General Description

Thymolphthalien is an acid-base indicator which is colourless in acidic form and deep blue in basic form. Acidic form retains hydrogen on each hydroxyl group. It is suitable in preparing disappearing ink.

Thymolphthalein(125-20-2)Related Product Information

• Thymol Blue
• Bromothymol Blue
• Thyme Oil
• 1,1,3,3,5-PENTAMETHYL-4,6-DINITROINDANE
• Phenolphthalein
• Thymol
• ISOPROPYL LAURATE
• CHLOROPHOSPHONAZO III
• Isopropyl alcohol
• Phthalide
• Thymolphthalein-2μ,2-bis(methyliminodiacetic acid sodium salt), 3μ,3-Bis[N,N-di(carboxymethyl)aminomethyl]thymolphthalein
• THYMOL BLUE
• TOLUALDEHYDES
• Thymolphthalein monophosphate 2-amino-2-methyl-1,3-propanediol salt
• THYMOL VIOLET
• Thymolphthalein monophosphate magnesium salt
• THYMOLPHTHALEIN COMPLEXONE DISODIUM SALT
• Thymolphthalein monophosphoric acid disodium salt trihydrate