A dehydration reaction is a chemical reaction that occurs between two compounds in which water is one of the end products.
When two monomers may react to one another and an H or hydrogen atom of one monomer binds to OH or hydroxyl group of another monomer to make a dimer. In this reaction the end products that form are water and a dimer, it is an example of the dehydration reaction.
Water will be a product in a dehydration reaction. For example, when copper sulfate hydrate is heated, the water of crystallization vaporizes, leaving behind copper sulfate anhydrate.
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