What is the freezing point of a solution which contains 89.8 g of ethylene glycol (62.07 g/mol) which is a nonvolatile non electrolyte, in 500.0 g of water. For H2O Kf = 1.86oC/m.
What is the freezing point of a solution which contains 89.8 g of ethylene glycol (62.07 g/mol) which is a nonvolatile non electrolyte, in 500.0 g of water. For H2O Kf = 1.86oC/m.
Depression in in freezing point ( ∆Tf ) :-
When a non volatile solute is added to a pure solvent , its freezing point decreases .
If T° is freezing point of pure solvent and T is freezing point of solution then the difference (T° - T) is called depression in freezing point (∆Tf)
∆Tf = T° - T
Experimentally it was found that , ∆Tf is directly proportional to molality of solution
∆Tf = Kf × molality
∆Tf = Kf × (w/m) × 1000/W
Kf = freezing point depression constant
w = mass of solute
m = molar mass of solute
W = mass of solvent
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