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

BROMOTHYMOL  BLUE  FREE  ACID ACS

Synonyms:				3',3"-Dibromothymolsulfonephthalein

CAS No:				76-59-5

Chemical Formula:			C27H28Br2O5S

Formula Weight:			624.40

Description:				Beige to light pink to light brown 
to red powder

Assay: 				95% minimum
(by Spectrophotometry)

Clarity of solution:			To pass test

Loss on drying
@ 110 Deg.C/1 hour:		< 3% 

Visual Transition Interval:	From pH 6.0 (yellow)
To     pH 7.6 (blue)

Solubility 0.1% (EtOH):		Clear yellow solution

Solubility:				Soluble in ethanol, moderately soluble in
ethyl acetate and acetone, slightly soluble
in acetic acid and benzene and practically
insoluble in water.

Effective Date: 02/04/19