EFFLORESCENT, HYGROSCOPIC , DELIQUESCENCE , EFFLORESCENCE SUBSTANCE - DEFINITION

 EFFLORESCENT, HYGROSCOPIC , DELIQUESCENCE ,  EFFLORESCENCE SUBSTANCE -    DEFINITION





Some Important Characters of Compounds


EFFLORESCENT SUBSTANCE - DEFINITION

An efflorescent substance is a chemical which has water associated with its molecules, and which, when exposed to air, loses this water through evaporation. A common example of this phenomenon is the drying of cement. 

HYGROSCOPIC SUBSTANCE - DEFINITION

This is when substances absorb water from air, but not enough to form solutions. Examples of such substances include CaO,NaNO3,NaCl, sucrose and CuO. Also, certain liquid substances absorb water from the air to get diluted, these are also regarded as being hygroscopic. Example, conc. H2SO4 and conc. HCl. lf a hydroscopic substance absorbs so much moisture that an aqueous solution is formed, the substance becomes deliquescent.

DEFINITION OF DELIQUESCENCE - DEFINITION

Deliquescence, the process by which a substance absorbs moisture from the atmosphere until it dissolves in the absorbed water and forms a solution.
Example are solid 
NaOHCaCl2CaCl2.6H2O

DEFINITION OF EFFLORESCENCE - DEFINITION

Efflorescence, spontaneous loss of water by a hydrated salt, which occurs when the aqueous vapor pressure of the hydrate is greater than the partial pressure of the water vapor in the air. 
Examples are 
Na2SO4.10H2O,  Na2CO3.10H2O and FeSO4.7H2O 

 


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