Copperfll sulfate pentahydrate

When crystals of a compound are grown from a solvent, they may contain solvent of crystallization, if the solvent is water, the compound is a hydrate. The formula of the solvated compound shows the molar ratio in which the solvent of crystallization is present, e.g. CuS04-5H20, copperfll) sulfate pentahydrate or copperfll) sulfate-water (1/5). 

Hydrates are compounds that have a specific number of water molecules attached to them. For example, in its normal state, each unit of copperfll) sulfate has five water molecules associated with it. The systematic name for this compound is copperfll) sulfate pentahydrate, and its formula is written as CUSO4 5H2O. The water molecules can be driven off by heating. When this occurs, the resulting compound is CUSO4, which is sometimes called anhydrous copperfll) sulfate anhydrous means that the compound no longer has water molecules associated with it (see the photo in the margin). Some other hydrates are... 

Hydrates are named from the anhydrous compound, followed by the word hydrate with a prefix to indicate the number of water molecules per formula unit of the compound. For example, CUSO4 5H2O is known as copperfll) sulfate pentahydrate. 

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