Molal depression constant for a solvent is . The depression in the freezing point of the solvent for
is :
( Assume complete dissociation of the electrolyte )
Depression in freezing point -
-
Mathematical Expression of Depression in Freezing point -
- wherein
m = molarity of solvent
= cryoscopic constant
molal depress const
Units =
Vant Hoff factor (i) -
In case of electrolytes the observed colligative property is different from theoritical colligative property. There ratio is defined by Vant Haff factor
- wherein
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