Problem: Assuming 100% dissociation, calculate the freezing point and boiling point of 2.96 m Na2SO4(aq).

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We’re being asked to determine the freezing point and boiling point of an aqueous Na2SO4 solution. Aqueous means that Na2SO4 was dissolved in water.


When calculating the freezing point of a solution, we’re going to use the Freezing Point Depression equation. On the other hand, when calculating for the boiling point of a solution we’re going to use the Boiling Point Elevation equation.


Freezing Point Depression:

∆Tf = change in freezing point = Tf pure solvent –Tf solution
Kf = freezing point depression constant
i = van' t Hoff factor of the solute = no. of ions
m = molality

Boiling Point Elevation:

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Problem Details

Assuming 100% dissociation, calculate the freezing point and boiling point of 2.96 m Na2SO4(aq).


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