Concept explainers
In the lab, you dissolve 179 g of

Interpretation:
The freezing point of a solution have to be calculated.
Concept introduction:
For electrolytic solutes, the depression of the freezing point is directly proportional to molalityof the solution.
Freezing point depression
Answer to Problem 100A
The freezing point of the solution is − 10.5 °C.
Explanation of Solution
Given information:
Mass of MgCl2 = 179 gm
Volume of water = 1000 mL
Write the expression for freezing point depression
Write the expression for the number of moles of
(Note: Molecular weight of MgCl2 = 95.2 gm/mol)
Calculate the mass of water.
Calculate the molality of the solution.
MgCl2is strong electrolyte, it dissociates completely in the solution to give three ions (one Mg2+ and two Cl- ion). So, i = 3
The freezing point of the solution is:
Thus, the freezing point of the solution is
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