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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

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About This Item

Empirical Formula (Hill Notation):
C16H11AsN2Na2O10S2
CAS Number:
3688-92-4
Molecular Weight:
576.30
MDL number:
MFCD00003888
UNSPSC Code:
12352103
EC Index Number:
222-993-1
NACRES:
NB.21
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Product Name

Thorin, indicator for sulfate titration

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

SMILES string

[As](=O)([O-])([O-])c1c(cccc1)N\N=C2/c3c(cc(cc3)[S](=O)(=O)O)C=C(C/2=O)[S](=O)(=O)O.[Na+].[Na+]

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

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Absorption maximum λmax. (Propan-2-ol): 480 - 490 nm
Spec. Absorptivity A 1%/1cm (λmax; 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

pictograms

Skull and crossbonesEnvironment
GHS06,GHS09

signalword

Danger

Hazard Classifications

Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Acute 1 - Aquatic Chronic 1

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

Storage Class

6.1A - Combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials

Certificates of Analysis (COA)

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Global Trade Item Number

SKUGTIN
108294000504022536102160