S P E C I F I C A T I O N S

CHROMOTROPIC ACID DISODIUM SALT ACS

Synonyms:				4,5-Dihydroxynaphthalene-2,7-disulfonic acid
					disodium salt

CAS Number:				5808-22-0

Chemical Formula:				(HO)2C10H4(SO3Na)2*2H2O

Formula Weight:				400.29

Appearance:					White to grey, beige or brown powder

Infrared Spectrum:				Conforms to structure and standard

Melting Point:				>300 Deg. C

Loss on drying:				9.0 – 10.0%

Assay on dried basis:			97.0% minimum
 (by Nitrite value)

Aqueous solubility:			Very soluble

Clarity of Solution:				To pass test

Sensitivity to Formaldehyde:		To pass test

Sensitivity to Nitrate:			To pass test

NOTE:					Material darkens in storage with no loss in 	purity

Effective: 01/26/09