Deposition of salt from evaporated water

  1. When a small volume, say 5ml, of saturated solution of NaCl is left on a flat surface and evaporates, why does the salt always become concentrated on the outer edge of the base where the solution was? Why doesn't it form a uniform distribution of salt throughout the entire area which the solution previously took?
  2. jcsd
  3. sophiecentaur

    sophiecentaur 14,697
    Science Advisor
    Gold Member

    It could be something to do with the temperature distribution over the surface (due to evaporation) or the rate of water movement where the liquid is more shallow - the outside edge being a bit more concentrated..
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