MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Iron (III) chloride (FeCl3) solution. When sodium hydroxide is added to an iron (III) chloride solution a brown precipitate is formed. This can be used in forensics as well as chemistry to help to identify an unknown substance as iron (III) chloride.
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