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ⓘ Hydration is the adding of water molecules to a chemical substance. The anhydrous form and the hydrated form can be quite different. The hydrated form is called ..




Hydration
                                     

ⓘ Hydration

Hydration is the adding of water molecules to a chemical substance. The anhydrous form and the hydrated form can be quite different. The hydrated form is called a "hydrate". For example, anhydrous tin chloride is a liquid, while the pentahydrate is a solid. Anhydrous copper sulfate is white or light green, while the hydrated form is blue. Anhydrous cobalt chloride is blue, while the hydrated form is red. Anhydrous copper chloride is brown, while the dihydrate is green.

The number of water molecules for each atom is given by a prefix. Mono- means 1, di- means 2, tri- means 3, tetra- means 4, penta- means 5, hexa- means 6, hepta- means 7, octo- means 8, nona- means 9, deca- means 10.