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

o-CRESOLPHTHALEIN

Synonyms:					3,3-Dimethylphthalein

CAS No:					596-27-0

Chemical Formula:				C22H18O4

Formula Weight:				346.38

Description:					White to off-white crystalline powder

Absorptivity 1%/1cm			>1670
(in 0.1N NaOH) at λ 568nm

Loss on Drying @ 105 °C			4.0 % maximum

Visual Transition Interval			From pH 8.2 (colorless)
To     pH 9.8 (Violet Red)

Solubility in Ethanol:			Clear colorless solution				

Effective: 07/12/16