1.04594

Calcon (C.I.15705)

metal indicator

• Synonym(s): Calcon (C.I.15705), 2-Hydroxy-1-(2-hydroxy-1-naphthylazo)naphthalene-4-sulfonic acid sodium salt
• Empirical Formula (Hill Notation): C₂₀H₁₃N₂NaO₅S
• CAS Number: 2538-85-4
• Molecular Weight: 416.38
• UNSPSC Code: 12352107
• EC Index Number: 219-810-2

Properties

• Quality Level: 200
• form: solid
• loss: ≤10% loss on drying, 110°C
• pH: 9.4 (25 °C, 10 g/L in H₂O)
• solubility: 20 g/L
• bulk density: 530 kg/m³
• λmax: 634-640 nm (buffer pH 12.2)
• storage temp.: 2-30°C
• InChI: 1S/C20H14N2O5S.Na/c23-16-10-9-12-5-1-2-6-13(12)19(16)21-22-20-15-8-4-3-7-14(15)18(11-17(20)24)28(25,26)27;/h1-11,21,23H,(H,25,26,27);/q;+1/p-1/b22-20+;
• InChI key: YJUGDMOGPJJWDG-QPNALZDCSA-M

Description

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Absorption maximum λ_max. (buffer pH 12.2): 634 - 640 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.015 g/l; buffer pH 12.2; calculated on dried substance): 250 - 400
Loss on drying (110 °C): ≤ 10 %
Suitability as indicator (for metal titration): passes test

Safety Information

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