How does adding a non-volatile solute to a pure solvent affect the freezing point of the pure solvent?

The solvent will have a lower freezing point.

The solvent will have a higher freezing point.

The solvent's freezing point will not be affected.

The solvent's freezing point will most likely change, but not in a predictable way.

Question

How does adding a non-volatile solute to a pure solvent affect the freezing point of the pure solvent?
		
The solvent will have a lower freezing point.
		
The solvent will have a higher freezing point.
		
The solvent's freezing point will not be affected.
		
The solvent's freezing point will most likely change, but not in a predictable way.

jfraser · Answer

All the colligative properties use the same basic principle: the solute interferes with the solvent's ability to change phases. Does that help at all?