chemistry - colours of ions

CrO₄²⁻

CrO₄²⁻

yellow

chromate ion

yellow

Cr₂O₇²⁻

orange

dichromate ion

orange

Mn²⁺

very pale pink/colourless

manganese(II) ion

very pale pink/colourless

Fe²⁺

pale green

iron(II) ion

pale green

Fe³⁺

yellow

iron(III) ion

yellow

Co²⁺

pink

cobalt(II) ion

pink

Cu²⁺

blue

copper(II) ion

blue

Ni²⁺

green

nickel(II) ion

green

MnO₄⁻

purple

permanganate ion

purple

Cr³⁺

green

chromium(III)

green

iron(II)* chloride

pale green

copper(II)* sulphate

blue

cobalt(II)* chloride

pink

potassium dichromate*

orange

potassium permanganate*

purple

iron(III)* nitrate

yellow

sodium chloride

colourless

magnesium hydroxide

colourless

chromium(III)* nitrate

green

magnesium hydrogencarbonate

colourless

hexacyanoferrate ion

blue

Fe(CN)₆³⁻

blue