MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Solutions of transition metals. From left to right are: Cobalt (II) chloride (CoCl2). Iron (II) chloride (FeCl2). Iron (III) chloride (FeCl3). Copper (II) chloride (CuCl2). When sodium hydroxide is added to these solutions a distinctive coloured precipitate of insoluble salt is formed which helps to identify them. This can be used in forensics as well as chemistry.
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