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

BROMOCRESOL PURPLE SODIUM SALT ACS

Synonyms:					5',5"-Dibromo-o-cresolsulfonephthalein
	Sodium salt	

CAS No:					62625-30-3

Chemical Formula:				C21H15Br2O5SNa

Formula Weight:				562.22

Description:					Purple-brown to orange
	crystalline powder

Visual Transition Interval:		From pH 5.2 (yellow)
	To     pH 6.8 (purple)

Clarity of Solution:				To pass test

Solubility 0.1% (Water):			Clear reddish yellow solution

Loss on drying at 110
Deg.C (1hr):					5.0% maximum

Dye content:					90% minimum
(by Spectrophotometry)  

Absorptivity 1%, 1cm
(pH 6.8) at Lambda max. 589 nm:		870-1050

Effective Date 01/01/16