# Is the freezing point of solution always lower?

If the freezing point of a solution always lower than that of the pure solvent or is it possible for it to end up being higher?

• Depends on your definition of solution. Is $^2\ce{H2O}$ in $^1\ce{H2O}$ close enough? Because that's the only way I know to make a "solution" and have the FP go down. – SendersReagent Feb 9 '16 at 10:06
• Of course not. Whether you're talking only about aqueous solutions or other ones. – Mithoron Feb 9 '16 at 12:06
• Thanks. There's no way the freezing point could not change either is there? – Caesium-133 Feb 9 '16 at 13:17
• Whoops. Go up* sorry. – SendersReagent Feb 9 '16 at 13:50
• Consider the enthalpic and entropic contributions in the small solute limit. Entropy will win, lowering the freezing point. – Jon Custer Feb 9 '16 at 15:17