Multiple Choice
A solution was prepared by dissolving 2.500 g of a non-dissociating solute in 125 g of pure water. The resulting solution has a freezing point of -0.190°C. The Kf of water is 1.86°C/m. What is the molar mass of the unknown solute?
14. Solutions
Freezing Point Depression
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What happens to the volume of liquid water when it freezes?
A
The volume fluctuates.
B
The volume increases.
C
The volume remains the same.
D
The volume decreases.
Verified step by step guidance1
Understand the concept of water's behavior when it freezes: Water is one of the few substances that expands when it freezes due to the formation of a crystalline structure.
Recognize that the molecular structure of ice is less dense than that of liquid water. This is because the hydrogen bonds in ice hold the water molecules in a hexagonal lattice, which takes up more space.
Recall that density is defined as mass per unit volume. Since the mass of water remains constant during freezing, an increase in volume results in a decrease in density.
Consider the implications of this expansion: When water freezes, it occupies more volume than it did in its liquid state, which is why ice floats on water.
Conclude that the volume of liquid water increases when it freezes, as the structure of ice causes it to expand.
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