Merck
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1.08176

Supelco

Thymol blue

indicator ACS, Reag. Ph Eur

Synonym(s):
Thymol blue, Thymolsulfonphthalein
Empirical Formula (Hill Notation):
C27H30O5S
CAS Number:
Molecular Weight:
466.59
MDL number:
EC Index Number:
200-973-3

Quality Level

grade

ACS reagent

Agency

reag. Ph. Eur.

form

solid

loss

≤3% loss on drying, 110°C

visual transition interval

1.2-2.8, red-violet to brownish-yellow(1st transition range)
7.8-9.5, greenish yellow to blue(2nd transition range)

mp

221 °C (decomposition)

bulk density

350 kg/m3

storage temp.

15-25°C

InChI

1S/C27H30O5S/c1-15(2)19-13-22(17(5)11-24(19)28)27(21-9-7-8-10-26(21)33(30,31)32-27)23-14-20(16(3)4)25(29)12-18(23)6/h7-16,28-29H,1-6H3

InChI key

PRZSXZWFJHEZBJ-UHFFFAOYSA-N

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Analysis Note

1st transition range: pH 1.2 - pH 2.8 violet red - brownish yellow
2nd transition range: pH 7.8 - pH 9.5 greenish yellow - blue
Appearance of solution: passes test
Loss on drying (110 °C): ≤ 3
Transition range (according to ACS): passes test
Sensitivity test: passes test

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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