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

4-(2-PYRIDYLAZO)RESORCINOL
MONOSODIUM SALT ACS

Synonyms:				PAR monosodium salt hydrate

CAS No:				16593-81-0

Formula:				C11H8N3NaO2

F.W.:					237.21

Appearance:				Orange to Dark-Orange to Brown Powder.

Identification (IR):			To conform to standard.

Absorptivity: 			>1300 
(15/1 cm, at λ max. 413.0nm) 

Dye Content				90% minimum
(by Spectophotometry)
				
Clarity of Solution:			To pass test

Suitability as a complexo-		To pass test
 metric indicator (Pb):		

Loss on Drying:			<10%
@ 105° C 1 hr.

Effective: 01/05/19