Colours of ions in aqueous solution

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lokjon
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Last updated: June 5, 2026
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First submittedJune 5, 2026
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Ion
Formula
Answer
Copper(II)
Cu(2+)
Blue or green
Iron(II)
Fe(2+)
Pale green
Iron(III)
Fe(3+)
Yellow or brown
Cobalt(II)
Co(2+)
Pink
Nickel(II)
Ni(2+)
Green
Chromium(III)
Cr(3+)
Green
Chromate
CrO4(2-)
Yellow
Dichromate
Cr2O7(2-)
Orange
Manganese(II)
Mn(2+)
Very pale pink
Permanganate
MnO4(-)
Purple
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