fumarates

[Eng. fumar ( ic ); -ate.] Chem.: Salts of fumaric acid. Most of the fum a rates are soluble in water; the silver salt is insol uble; they are insoluble in alcohols. Fumarate of ammonium or sodium gives a pale brown-red precipitate with ferric chloride, insoluble in exce of ammonium fumarate. liberation of CO2; also by the action of two molecules of bromine and water on pyromucic acid, C5H4O3+2H2O+2Br2=C4H4O3+CO2+4HBr. It is a syrup, which crystallizes with difficulty. ( Watts : Dict . Chem.)