MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Adding water to de-hydrated copper sulphate. Water being added to a test tube containing de-hydrated (anhydrous) copper (II) sulphate (CuSO4, white). The copper (II) sulphate forms hydration bonds with the water in an exothermic (heat-producing) reaction, resulting in hydrated copper (II) sulphate (blue). The heat of the reaction is enough to produce steam. For the reverse of this reaction see image A500/0825.
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