In chemistry and the biological sciences, a dehydration reaction is usually defined as a chemical reaction that involves the loss of a water molecule from the reacting molecule. Dehydration reactions are a subset of condensation reactions. Because the hydroxyl group (–OH) is a poor leaving group, having a Brønsted acid catalyst often helps by p...
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http://en.wikipedia.org/wiki/Dehydration_reaction
(from the article `metamorphic rock`) ...but in general the fluid and rock-load pressures tend to be rather similar during such reactions. The water virtually fights its way out by ...
Found on
http://www.britannica.com/eb/a-z/d/25
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