Thorin

Structural formula
General
Surname	Thorin
other names	Disodium 4 - [(2-arsonophenyl) diazenyl] -3-hydroxy-2,7-naphthalene disulfonate ( IUPAC );
Molecular formula	C 16 H 11 AsN 2 Na 2 O 10 S 2
Brief description	red to red-brown solid
External identifiers / databases
EC number	222-993-1
ECHA InfoCard	100.020.903
PubChem	77269
ChemSpider	21171961
Wikidata	Q416786
properties
Molar mass	576.3 g mol −1
Physical state	firmly
solubility	soluble in water
safety instructions
H and P phrases	H: 331-301-410
	P: 273-304 + 340-309 + 310
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Thorin is a chemical compound that is used as an indicator and complexing agent .

properties

Thorin is a red solid that is soluble in water.

use

Thorin is used in water analysis as an indicator for the titrimetric determination of sulfate ions with barium perchlorate solution . Because of its properties as a complexing agent, it is also used to detect certain metal ions. The evidence of thorium ions was the reason for the naming. Thorium (IV) ions can be quantitatively determined photometrically via the red colored complex . Similarly, uranium (IV) salts are quantified in this way.

literature

Hermann Römpp : Basic Lexicon of Chemistry . Georg Thieme Verlag, 1999, ISBN 3-13-115711-9 .
Bruno Lange , Zdenek J Vejdelek: Photometric analysis . Verlag Chemie, Weinheim 1980, pp. 268, 279, ISBN 3-527-25853-1 .

Individual evidence

↑ ^a ^b ^c Entry on Thorin. In: Römpp Online . Georg Thieme Verlag, accessed on July 18, 2011.
↑ ^a ^b Entry on Thorin in the GESTIS substance database of the IFA , accessed on May 16, 2011(JavaScript required) .
↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry arsenic compounds, with the exception of those named in this appendix in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA) on November 17, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .

[roempp-1] Entry on Thorin. In: Römpp Online . Georg Thieme Verlag, accessed on July 18, 2011.

[GESTIS-2] Entry on Thorin in the GESTIS substance database of the IFA , accessed on May 16, 2011(JavaScript required) .

[CLP_100.240.769-3] Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry arsenic compounds, with the exception of those named in this appendix in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA) on November 17, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .