Merck 102498 0025 Chromotropic Acid Disodium Salt Dihydrat 25 GR.

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Description
Catalogue Number	102498
Replaces	DX1460-1
Synonyms	4,5-Dihydroxy-2,7-naphthalene disulfonic acid sodium salt

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Product Information
CAS number	5808-22-0
EC number	204-972-9
Grade	ACS,Reag. Ph Eur
Hill Formula	C₁₀H₆Na₂O₈S₂ * 2 H₂O
Molar Mass	400.29 g/mol
HS Code	2908 99 00
Structure formula Image
Quality Level	MQ200

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Physicochemical Information
Melting Point	300 °C
pH value	3.6 (10 g/l, H₂O, 20 °C)
Bulk density	780 kg/m3
Solubility	170 g/l

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Safety Information according to GHS
Hazard Pictogram(s)	\n
Hazard Statement(s)	H315: Causes skin irritation.\nH319: Causes serious eye irritation.\nH335: May cause respiratory irritation.
Precautionary Statement(s)	P261: Avoid breathing dust/ fume/ gas/ mist/ vapours/ spray.\nP264: Wash skin thoroughly after handling.\nP271: Use only outdoors or in a well-ventilated area.\nP280: Wear protective gloves/ eye protection/ face protection.\nP302 + P352: IF ON SKIN: Wash with plenty of water.\nP305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Signal Word	Warning
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 below +30°C.

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Transport Information
Declaration (railroad and road) ADR, RID	Kein Gefahrgut
Declaration (transport by air) IATA-DGR	No Dangerous Good
Declaration (transport by sea) IMDG-Code	No Dangerous Good

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Specifications
Appearance	greyish white to brownish white powder
Assay (acidimetric, calc. on anhydrous substance)	≥ 98.5 %
Identity (IR-spectrum)	passes test
Appearance of solution (5 %; water)	passes test
Water (according to Karl Fischer)	8.5 - 9.5 %
Sensitivity (of formaldehyde)	passes test
Sensitivity (of nitrate)	passes test