[FeLiXe]

Hi, I was just wondering about something:

Are there mixtures where the melting point of the mixture is higher than both the melting points of the  single components? Could you then take the two pure liquid components and cool them to their melting point. When you'd poor the two liquids together the melting point of the mixture would be higher and part of it freezes.

Does that work? It seems kind of weird to me.

thanks for any answers

[Mitch]

Technically a mixture isn't homogenous and would have several different melting points corresponding to its constituents.

[Borek]

Perhaps he says mixture, but thinks solution?

[Donaldson Tan]

There are SOLUTIONS that exhibit higher boiling.melting point than the boiling/melting point of each constituent. This is due to stronger intermolecular bonding between the constituents than intermolecular bonding between 2 molecules of the same constituent. Such behavior is called negative deviation from Raoult's Law.

[FeLiXe]

yeah I was talking about something homogeneous. I guess solution would have been the right word. has anyone done something like that? I think it would be kind of cool to pour two liquid substances together and part would freeze. kind of like a precipitate but you know it isn't ;-)

[Borek]

l-carvoxime + d-carvoxime

I think AWK may know more.

[Dude]

There is an interesting "parlor trick" that occurs when hexafluorobenzene and benzene are mixed together.  The two liquids form a white precipitate.  The precipitate is actually a complex that forms from interactions of the pi electrons if I remember correctly.  Therefore, the solid could be construed as forming from a chemical reaction.  However, there are not many liquid-liquid additons that result in solid formation.

[AWK]

l-carvoxime + d-carvoxime

I think AWK may know more.

Ideally pure enantiomeric carvoximes show m.p. of  56-57 C, its racemate shows m.p. 93-94 C