GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Evaporation of water and salt solution. Equal amounts of distilled water (H2O, left) and aqueous salt solution (sodium chloride, NaCl, right) are placed in two watch glasses (top frame). After water evaporates, there is no residue in the left watch glass but NaCl crystals are formed in the right watch glass (bottom frame).
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