ammonium carbonate(redirected from E503)
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1. A carbonate of ammonium, (NH4)2CO3.
2. The white, crystalline double salt of ammonium bicarbonate and ammonium carbamate, (NH4)HCO3·NH4CO2NH2, produced commercially and used in smelling salts and baking powder. Also called hartshorn.
1. (Elements & Compounds) an unstable pungent soluble white powder that is a double salt of ammonium bicarbonate and ammonium carbamate: used in the manufacture of baking powder, smelling salts, and ammonium compounds. Formula: (NH4)HCO3.(NH4)CO2NH2
2. (Elements & Compounds) an unstable substance that is produced by treating this compound with ammonia. Formula: (NH4)2CO3
a water-soluble mixture of carbonate and carbamate of ammonium: used chiefly in smelling salts and baking powder; hartshorn.