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

BROMOPHENOL RED FREE ACID

Synonyms:				5’,5”-Dibromophenol sulfonphthalein

CAS No:				2800-80-8			   				

Chemical Formula:			C19H12Br2O5S

Formula Weight:			512.19

Appearance:				Red to reddish-brown to brown powder

Identification (IR):			To match standard.

Assay (UV vis):			> 95%

Loss on drying:			5.0% max.

Absorptivity 1%/1cm,		340 - 370
(pH 4.7) at λ, 442.0nm

Absorptivity 1%/1cm,		585-720
(pH 6.3) at λ, 580nm

Solubility:				
(0.1% in 20% ethanol) 		Clear and complete

Visual transition interval:		From  pH 5.2 (Yellow to Yellow-red) 
					To       pH 7.0 (Magenta to Purple)

Effective Date 07/12/16