Question

Mention the condition for efflorescence

Answer 1

Efflorescence

• Efflorescence is an important property of a hydrated and anhydrous substance
• The phenomenon in which a compound loses its water of crystallization on exposure to dry air is called efflorescence and substances are said to be efflorescent substances.
• Due to this phenomenon hydrated salts when left exposed to the atmosphere lose their water of crystallization and crumble down to form a powder.
• The condition of efflorescence is

aqueous vapor pressure of the hydrate > the partial pressure of the water vapor in the air.