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Cu1+

Green

Fe

Yellow to red-orange (depending on anion and charge of Fe); in rare cases, can form complex ion with a deep blue color

Fe2+

yellow-green (depending on the anion)

Fe3+

orange-red (depending on the anion)

Cr3+

Violet (Cr(NO3)3 to Green (CrCl3)

Ni2+

Green

MnO4-

Purple (Mn w/ +7 oxidation state is purple)

CrO42-

Yellow

Cr2O72-

Orange

Cu(NH3)42+

Dark Blue; produced when ammonia is added to Cu2+ solutions

FeSCN2+

Red-brown, Wine-red to dark orange

Al, K, Li, Mg, Na, Ca, Ba, Sr, Zn

colorless aqueous ions and most of their solid salts are white.

Transition element ions with partially filled d orbitals

tend to release colored light.

Pb3+

blue-green (Pb2+ and Pb4+ are colorless)

V2+

violet

V3+

blue-green

Zn2+

Colorless/Milky

CoCl42-

Blue (Co2+ with HCl will form a CoCl42- complex that is blue)

Ti(H2O)63+

Purple

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