Sodium hydroxide added to iron II sulfate. The precipitate of this transition metal ion is a dark green. A precipitate may be formed when a few drops

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Sodium hydroxide added to iron II sulfate. The precipitate of this transition metal ion is a dark green. A precipitate may be formed when a few drops of sodium hydroxide are added to a solution of a metal compound. The result is solid iron ii hydroxide in a colourless solution of sodium sulfate.

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Photo credit: © MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: chemical, chemistry, color, colour, compound, distinctive, experiment, green, hydroxide, ii, ion, iron, metal, precipitate, reaction, science, sodium, solution, sulfate, test, transition, tube