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dehydration (chemistry)

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dehydration

In chemistry, the removal of water from a substance to give a product with a new chemical formula; it is not the same as drying.

There are two types of dehydration. For substances such as hydrated copper sulphate (CuSO4.5H2O) that contain water of crystallization, dehydration means removing this water to leave the anhydrous substance. This may be achieved by heating, and is reversible.

Some substances, such as ethanol, contain the elements of water (hydrogen and oxygen) joined in a different form. Dehydrating agents such as concentrated sulphuric acid will remove these elements in the ratio 2:1.
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