MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Copper (II) chloride (CuCl2) solution. When sodium hydroxide is added to a solution of copper (II) chloride a blue coloured precipitate is formed. This can be used in forensics as well as chemistry to help to identify an unknown substance as copper (II) chloride.
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