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

4-(2-PYRIDYLAZO)RESORCINOL
FREE ACID ACS

Synonyms:				PAR Free Acid; 1,3-Benzonediol, 4-(2-Pyridinylazo)-

CAS No:					1141-59-9

Formula:					C11H9N3O2

F.W.:						215.21

Appearance:					Orange Powder

Solubility:					Soluble in water
Slightly soluble in ethanol
Insoluble in ether and other 
low-polarity solvents

Clarity of Solution:				To pass test

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

Loss on drying at 110 Deg.C/1hr		<5.0%

Absorptivity 1%/1cm
At Lambda max. 403.0 nm

Effective: 01/05/09