I know salt does. I did an experiment at home. I took six cups water at 45degree f boiled it with no salt and it took 2 minutes longer to boil than six cups of water at the same temperature with a...
Dissolved solids (salt, sugar or anything else in there, This will raise the temperature). Pressure lower pressure means less temperature needed to boild the warer. (altitue on earth will do this...
Some of the water might evaporate but as for the sugar it will dissolve. This is a homogeneous mixtures because you wouldn't be able to tell out the different parts (sugar and water) once it is mixed...