Anhydrous
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An ionic crystal is said to be anhydrous if it contains no water.
An example of anhydration can be seen in copper (II) sulfate. If the water of crystallization is removed from blue crystals of copper (II) sulfate, a white powder (anhydrous copper sulfate) is formed.
The original formula for crystalline copper (II) sulfate is CuSO(4) ˑ 5 H(2)O. The formula for anhydration is as follows:
heat + CuSO(4) ˑ 5 H(2)O → CuSO(4) + 5 H(2)O
Another example is in the heating of magnesium sulfate heptahydrate, MgSO(4)•(7)H2O. On heating, it undergoes the following reaction: MgSO(4)• 7H(2)O + heat -> MgSO(4) + 7H(2)O
anhydrous copper sulphate + water → copper sulphate