Desalination is a process by which salt is removed from a salt water solution. This process is done by heating water. Why would heating the water separate the solute and solvent in this case?
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The water will evaporate before the salt, thus turning it into a gas and leaving the salt behind
The heat will cause the particles of the solution to move so fast that they shake themselves apart
The water and salt will undergo a chemical change from the added heat. One of the indicators of chemical change is a change in color, so you will be able to see which is water and which is salt and separate them