What happens to the vapor of pressure of a liquid when some solid is dissolved in it?
Vapour pressure decreases. One of the rules you get taught in chemistry is that if you add a soluble substance to a liquid, changing states becomes harder. The boiling point increases, melting point decreases and evaporation becomes slower. This is why you add salt to boiling water when cooking to raise the temperature of boiling, thus cooking faster. Hope this helps!
