Merck
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1.04594

Supelco

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:
Molecular Weight:
416.38
EC Index Number:
219-810-2

Quality Level

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

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Absorption maximum λmax. (buffer pH 12.2): 634 - 640 nm
Spec. Absorptivity A 1%/1cm (λmax; 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

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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