In water the table salt (mineral halite) NaCl dissolves in to sodium ions and chlorine ions. The Chlorine ions are surrounded by water molecules and the sodium ions float around somewhat freely. They will stay in solution. when you start to remove water the ions will reform in to halite. The difference is that the sodium ions attract the chlorine ions in preference to the chlorine evaporating in to the air. Not to say it doesn't happen but its rare.
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