Tannic acid - EXTRA PURE , LABORATORY CHEMICALS, SPECIFICATION

TANNIC ACID
Product	TANNIC ACID
TEST	SPECIFICATION	Results
Descriprion
Colour	Yellowish white impalpable powder	Passes
Odour	Characterstic
Taste	Strongly astrigent
Solubility	Soluble in water; Alcohol; solvent ether	Passes
	Chloroform ;Acetone; Glycerine

Identification	soln plus soln of gelation	Passes
	PRECIPITATE
	soln plus soln of Albumin	Passes
	PRECIPITATE
	soln plus Ferric Chloride	Passes
	Test Soln: Bluish Black Colour
	on addition of Sulphuric Acid Dilute
	Colour disappears & a reddish brown
	PRECIPITATE is produced
	Opical rotation of Soln.	Passes
	Dextrororatory

Reaction	Soln acid to soln of Methyl red	Passes

Gum,Dextrin, Sugars	To 2 ml of 20% w/v soln add 2 ml of	Passes
& salts	Alcohol (90% v/v)
	Soln remains clear
	Shows no Turbidity on addition
	of 1 ml Solvent ether

Loss on Drying	Losses not more than 12% of it wt, when	2.64%
	dried to a constant weight at 105 deg C

Sulphated Ash	Not more than 0.2 %	0.19%