Chemistry
(a) Define efflorescence. Give examples.
(b) Define deliquescence. Give examples.
Acids Bases Salts
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Answer
(a) Efflorescence is the property of some salts to loose wholly or partly their water of crystallisation when their crytals are exposed to dry air even for a short time.
Examples: MgSO4.7H2O (Epsom salt) , Na2SO4.10H2O (Glauber's salt).
(b) Certain water-soluble substances, when exposed to the atmosphere at ordinary temperature, absorb moisture from the atmospheric air to become moist and ultimately dissolve in the absorbed water, forming a saturated solution. The phenomenon is called deliquescence and the salts are called deliquescent.
Examples: Caustic soda (NaoH), Caustic potash (KOH)
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