what are some of the factors that affect melting point besides, impurities, pressure, and having a wet solution?

Answer 1

For a single compound or solvent, pressure and dissolved solute concentration (including impurities) are the important variables. Of course, the melting point depends very much upon the material chosen.

I don't know what you mean by the "wet solution" effect.

Answer 2

well if it is wet then the solution will contain some impurities from the water or which ever other compound is added to the solution.

Answer 3

A wet solid is likely to be impacted to a large extent in the melting point. But it isn't the impurities that you worry about so much with the melting point of solids. It's the water.