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

Metalphthalein ACS

Synonyms:			Phthalein Purple; O-Cresolphthalein Complexone ACS;
Xylenylphthalein-bisiminodiacetic acid

CAS No.:				2411-89-4

Chemical Formula:			C32H32N2O12

Formula Weight:			636.60

Appearance:				White to light pink to tan crystalline powder

Identification:			Conforms to structure and standard

Residue on ignition:		0.5% maximum

Loss on drying:			10.0% maximum

Lamda Max:				575(377)nm in 0.1 N sodium hydroxide

Clarity of solution:			To pass test

Suitability as a mixed indicator
 for complexometry:		To pass test

Effective: 02/16/10