chemistry - transition metals

hexaaquacopper (II) [Cu(H2O)6]2+

Pale Blue Solution

Copper (II) Hydroxide Cu(OH)2(H2O)4

Add NH3 dropwise, forms pale blue ppt

tetraamminediaquacopper (II) [Cu(NH3)4(H2O)2]2+

Excess NH4, forms dark blue soln

diaquatetrachlorocopper (II)

Excess HCl, Yellow soln

Cu+

Reduction of Cu2+ with I-
White ppt of CuI and brown I2

Cu2+/Cu

Disproportionation of Cu+
Brown Cu Solid & Blue CuSO4 soln

diaquatetraamminecobalt (II) [CoCl4(H2O)2]2-

Blue Soln

hexaaquachromium (III) [Cr(H2O)6]3+

Pale purple
Apply heat goes to green

Chromium (III) Hydroxide Cr(OH)3(H2O)3

NH4 dropwise to Cr3+
dark green ppt

hexaamminechromium (III) [Cr(NH3)6]3+

Purple soln

Chromium (III) Hydroxide Cr(OH)3

Dark Green soln

Acidified Cr2O7 2-

Orange soln

CrO4 2-

Oxidation of Cr3+ with hot alkaline H2O2
Yellow soln

Hexaaquamanganese (II) [Mn(H2O)6]2+

Pale pink soln

Manganese (II) Hydroxide Mn(OH)2(H2O)4

NaOH dropwise, pale brown ppt

Hexaaquairon (II) [Fe(H2O)6]2+

Pale green soln

Iron (II) Hydroxide Fe(OH)2(H2O)4

NaOH Dropwise, dark green ppt

Hexaaquairon (III) [Fe(H2O)6]3+

Yellow soln

Iron (III) Hydroxide

NaOH dropwise, orange-brown ppt

MnO4-/Fe2+ → Mn2+/Fe3+

Purple to pale pink

I-/Fe3+ → I2/Fe2+

Orange brown to brown