Question
In: Chemistry
9. Calculate the freezing point and boiling point of the following aqueous solutions, assuming complete dissociation:...
9. Calculate the freezing point and boiling point of the
following aqueous solutions, assuming
complete dissociation:
(a) 10.5 g FeCl3 in 1.50
Solutions
Expert Solution
(a) The expression for the depression in the freezing point is
Here, Kf is the depression in the freezing point constant, W2 is the mass of solute in kg, M2 is the molar mass of solute in kg and W1 is the mass of water in kg.
Substitute values in the above expression.
The freezing point of the solution is 
The expression for the elevation in boiling point is 
Here, Kb is the elevation in boiling point constant, W2 is the mass of solute in kg, M2 is the molar mass of solute in kg and W1 is the mass of water in kg.
Substitute values in the above expression.
The boiling point of the solution is 
(b) The expression for the depression in the freezing point is
Here, Kf is the depression in the freezing point constant, W2 is the mass of solute in kg, M2 is the molar mass of solute in kg and W1 is the mass of water in kg.
Substitute values in the above expression.
The freezing point of the solution is 
The expression for the elevation in boiling point is
Here, Kb is the elevation in boiling point constant, W2 is the mass of solute in kg, M2 is the molar mass of solute in kg and W1 is the mass of water in kg.
Substitute values in the above expression.
The boiling point of the solution is 
(c) The expression for the depression in the freezing point is
Here, Kf is the depression in the freezing point constant, and m is the molality of the solution.
Substitute values in the above expression.
The freezing point of the solution is 
The expression for the elevation in boiling point is 
Here, Kb is the elevation in boiling point constant and m is the molality of the solution.
Substitute values in the above expression.
The boiling point of the solution is 
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