(Tfp) The freezing point of a solution is always lower than the freezing point of the pure solvent. The freezing point depression is roughly proportional to the molality of solute particles in the solution. Freezing point depression is an example of a colligative property of a solution. Found on http://antoine.frostburg.edu/chem/senese/101/glossary/f.shtml
Freezing-point depression describes the process in which adding a solute to a solvent decreases the freezing point of the solvent. Examples include salt in water, alcohol in water, or the mixing of two solids such as impurities in a finely powdered drug. In the last case, the added compound is the solute, and the original solid is thought of as th... Found on http://en.wikipedia.org/wiki/Freezing-point_depression
(from the article `liquid`) Another colligative property of solutions is the decrease in the freezing temperature of a solvent that is observed when a small amount of solute is ... Found on http://www.britannica.com/eb/a-z/f/60