• Many ionic compounds naturally contain water as part of the crystal lattice structure.
  • Ionic compounds that contain a transition metal are often highly colored.
  • It is common for the hydrated form of a compound to be of a different color than the anhydrous form, which has no water in its structure.
  • A hydrate is a compound that has one or more water molecules bound to each formula unit.
  • The name of the compound is cobalt(II) chloride hexahydrate and its formula is CoCl2•6H2O.
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