A chemical compound that contains ten molecules of water bonded to it.
From deca- (ten) + hydrate (containing water, from Greek hydro- meaning water). In chemistry, the number prefix indicates exactly how many water molecules are attached to the main compound.
Many common minerals and salts are decahydrates—for example, washing soda is sodium carbonate decahydrate—and the water molecules are so integral that removing them actually changes the chemical properties!
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