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22 terms

Aqueous Ion Colors

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Cu1+
Green
Cu2+
Blue
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)
Co2+
Pink
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.
Mn2+
Pink
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