bicarbonate is a colorless crystalline solid soluble in water. When heated, it
decomposes into carbon dioxide, water and ammonia gas. It is commonly called as
â??Volâ?? meaning volatile salt because of the dissociation reaction. When stored
in dry conditions, it forms lumps. Therefore it is best to use the chemical as
soon as possible.
bicarbonate is prepared by reacting carbon dioxide and aqueous ammonia. The
solution is maintained at low temperature since bicarbonate is unstable. The
process is carried out in an absorption column with the gas and aqueous phase
contacting counter-currently and when solution is saturated, crystals are
formed. The tower is cooled sufficiently since the reaction is exothermic. Subsequently,
the white crystals are filtered or centrifuged and washed followed by drying
with hot air.