Ammonium bicarbonate is a white orthorhombic or monoclinic crystal. There is ammonia smell. The desity is 1.58/cm. Soluble in water, the aqueous solution is alkaline, insoluble in . Minly as sponing agent use for baking foods such as crispcake, biscuit etc. In addition, it also widely used in chemical field such as flour brightening agent, rare earth deep processing, , plastics processing, eletronic element etc.