1.08294

Thorin

indicator for sulfate titration

• Synonym(s): Thorin, 1-(2-Arsonophenylazo)-2-hydroxy-3,6-naphthalene-disulfonic acid sodium salt, 2-(2-Hydroxy-3,6-disulfo-1-naphthylazo)-benzene-arsonic acid sodium salt
• Empirical Formula (Hill Notation): C₁₆H₁₁AsN₂Na₂O₁₀S₂
• CAS Number: 3688-92-4
• Molecular Weight: 576.30
• EC Index Number: 222-993-1

Properties

• Quality Level: 200
• form: solid
• impurities: ≤25% Water (Karl Fischer)
• pH: 6.1 (20 °C, 10 g/L in H₂O)
• bulk density: 700 kg/m³
• λmax: 480-490 nm (propan-2-ol)
• storage temp.: 2-30°C
• InChI: 1S/C16H13AsN2O10S2.2Na/c20-16-14(31(27,28)29)8-9-7-10(30(24,25)26)5-6-11(9)15(16)19-18-13-4-2-1-3-12(13)17(21,22)23;;/h1-8,18H,(H2,21,22,23)(H,24,25,26)(H,27,28,29);;/q;2*+1/p-2/b19-15+;;
• InChI key: ZQMPNLOZJUWHSA-WTBAQZMLSA-L

Description

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Absorption maximum λ_max. (Propan-2-ol): 480 - 490 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.025 g/l;propan-2-ol; calc. on anhydrous substance): 250 - 350
Water (according to Karl Fischer): ≤ 25 %
Suitability as indicator (for sulfate titration): passes test

Safety Information

• Pictograms: GHS06,GHS09
• Signal Word: Danger
• Hazard Statements: H301 + H331 - H410
• Precautionary Statements: P261 - P264 - P270 - P273 - P301 + P310 - P304 + P340 + P311
• Hazard Classifications: Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Acute 1 - Aquatic Chronic 1
• Storage Class Code: 6.1A - Combustible, acute toxic Cat. 1 and 2 / very toxic hazardous materials
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable