# Cooling Curves differences between Solution and Pure Solvent

To put it short, why is the cooling curve for a solution slanted during the phase change? The pure solvent plateaus at a fixed temperature, but for a solution, the phase change occurs over a range of temperatures. What explains this phenomenon?

• Well, it would be kinda surprising in freezing/melting of mixture had sharp peaks, even for pure compounds they can be quite broad, or even variable. – Mithoron Mar 13 '18 at 0:16