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

a-NAPHTHOLPHTHALEIN

Synonyms:					None 

CAS No.:					596-01-0

Chemical Formula:				C28H18O4

Formula Weight:				418.45

Description:					Dark Pink to Beige to Brown Powder 

Assay (Titration, NaOH):			<90%

Loss on drying: 				<5%
(110°C for 1hr)		

Absorptivity:				>650 
1%/1cm (in 0.1N NaOH) @ λ max.	

Solubility:					Clear to slightly Hazy Solution
(200mg + 4mL EtOH 95%)

Suitability Test:				To pass test				
(Suitable for use as a
pH Indicator)

Visual Transition Interval:		From pH 7.3 (pinkish-yellow)
						To      pH 8.7 (greenish-blue)

Effective Date: 11/01/19