Respuesta :
The anhydrous cpd could significantly decompose into a gaseous product or significantly react w/something in the air.
Water of hydration is water that is stoichiometrically bound into a crystal. While the water is found within a crystal, it is not directly bonded to a metal cation. Crystal salts containing water of hydration are called hydrates.
Many crystals form from particles dissolved in water or aqueous solutions. It's common for some of that water to be incorporated into the framework of a crystal. Usually, heating a crystal drives off water of hydration, but the structure of the crystal is lost.
Commercial root killers often contain copper sulfate pentahydrate (CuSO4·5H2O) crystals. The five water molecules are called water of hydration.
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