Merck 104593 0025 Hydroxynaphtol Blue Metal 25 GR.

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Description
Catalogue Number	104593
Synonyms	2,2'-Dihydroxy-1,1'-azonaphthalene-3',4,6'-trisulfonic acidtrisodiumsalt

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Product Information
CAS number	63451-35-4
EC number	264-197-7
Hill Formula	C₂₀H₁₁N₂Na₃O₁₁S₃
Molar Mass	620.47 g/mol
HS Code	2927 00 29
Structure formula Image
Quality Level	MQ100

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Physicochemical Information
pH value	2 - 3 (10 g/l, H₂O, 20 °C)
Bulk density	330 kg/m3
Solubility	340 g/l

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Safety Information according to GHS
Storage class	10 - 13 Other liquids and solids
WGK	WGK 3 highly hazardous to water
Disposal	3\nRelatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.

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Storage and Shipping Information
Storage	Store at +15°C to +25°C.

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Specifications
Identity (UV/VIS-Spectrum)	passes test
Appearance of solution (3 g/l; water)	passes test
Absorption maximum λmax. (buffer pH 12.0; EDTA)	645 - 650 nm
Spec. Absorptivity A 1%/1cm (λmax.; 0.005 g/l; buffer pH 12.0; EDTA; calc. on dried substances)	350 - 450
Loss on Drying (105 °C)	≤ 5 %
Suitability as indicator (for metal titration)	passes test