Preparation of hydroquinone quinine

Subject: Preparation of hydroquinone quinine Wed Jan 05, 2011 4:34 pm

Quinhydrone is benzene hydroquinone and hydrogen quinone molecular compound, is a kind of pale-green crystals, its surface, and metal luster, in ordinary under the density of hydroquinone quinone is 1.388 g/ml, melting point is ℃, sublimation 170 won't all decomposition will only decomposition, compares insoluble in water part but soluble in hot water, after dissolving solution is red brown, if soluble in ethanol and aether is yellow, but insoluble in petroleum ether, have special smell;
Quinhydrone commonly used for the determination of ph preparation, so how do? Explain each small plan: here will is 100 gold iron barium (sulfuric acid) in high iron ammonium ℃ of 300ml water; 65 Will 25g hydroquinone soluble in 100ml canister water. Then will stir in solution of iron ", namely, chromatography solution of hydroquinone the needle crystal. Cooling, filtering, with cold water washing, dried, then it will get quinhydrone 15g.