How could you test for water in a hydrated cobalt chloride?
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If we could examine blue cobalt chloride solid with an extremely powerful microscope, we would see a repeating, three-dimensional pattern of cobalt and chlorine atoms, known as a crystal structure. This regular, repeating internal arrangement of atoms is the reason that individual grains viewed through a magnifying lens, for example, look like tiny crystals.
As the humidity increases, and water is absorbed by CoCl2, the crystal structure rearranges itself to make room for water molecules. First, two water molecules surround each cobalt atom, forming the dihydrate, which is "chemistry speak" for "two water molecules."
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