Does adding salt to water lower its boiling point?
Look at the Figure here of the Great Salt Lake in Utah. The water in the lake is a solution of salt and water. Do you see the white salt deposits near the shore? How did the salt separate from the salt water? Water has a lower boiling point than salt, and it evaporates in the heat of the sun. With its higher boiling point, the salt doesn’t get hot enough to evaporate, so it is left behind.