1.08176

Thymol blue

indicator ACS, Reag. Ph Eur

• Synonym(s): Thymol blue, Thymolsulfonphthalein
• Empirical Formula (Hill Notation): C₂₇H₃₀O₅S
• CAS Number: 76-61-9
• Molecular Weight: 466.59
• MDL number: MFCD00005869
• EC Index Number: 200-973-3

Properties

• Quality Level: 200
• 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

Description

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

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable