Transition Metals

• [Cu(H2O)6]2+ is a pale blue solution
• [Cu(H2O)6]2+ is a pale blue solution
• When a small amount of NH3 is added to [Cu(H2O)6]2+ Cu(OH)2 solid forms (a pale blue precipitate)
• When a small amount of NH3 is added to [Cu(H2O)6]2+ Cu(OH)2 solid forms (a pale blue precipitate)
• When a small amount of NH3 is added to [Cu(H2O)6]2+ Cu(OH)2 solid forms (a pale blue precipitate)
• When excess NH3 is added to hexaaquacopper a dark blue solution forms
• When excess NH3 is added to hexaaquacopper a dark blue solution forms
• When excess HCl is added to Cu2+ a yellow solution forms (but it looks green) (CuCl4)2-
• When excess HCl is added to Cu2+ a yellow solution forms (but it looks green)
• Reduction of Cu2+ with I- forms a white precipitate (CuI) and brown solution (I2)
• Reduction of Cu2+ with I- forms a white precipitate (CuI) and brown solution (I2)
• Disproportionation of Cu+ forms brown solid (Cu) and blue solution (CuSO4)
• Disproportionation of Cu+ forms brown solid (Cu) and blue solution (CuSO4)
• Hydrated CoCl2 plus water and excess HCl forms blue solution (CoCl4)2-
• Hydrated CoCl2 plus water and excess HCl forms blue solution (CoCl4)2-
• KCr(SO4)2 goes from pale purple to blue when it is [Cr(H2O)6]3+ but with heat it looks green
• Add a small amount of NH3 to Cr3+ forms a dark green precipitate
• Add a small amount of NH3 to Cr3+ forms a dark green precipitate
• Add excess NH3 to Cr2+ forms a purple solution
• Add excess NH3 to Cr2+ forms a purple solution
• Add excess OH- to Cr(OH)3 forms a dark green solution
• Add excess OH- to Cr(OH)3 forms a dark green solution
• Cr2O7 2- is an orange solution
• Cr2O7 2- is an orange solution
• Oxidation of Cr3+ with hot alkaline H2O2 forms a yellow solution (CrO4)2-
• Oxidation of Cr3+ with hot alkaline H2O2 forms a yellow solution (CrO4)2-
• [Mn(H2O)6 2+ is a pale pink solution
• [Mn(H2O)6 2+ is a pale pink solution
• Add a small amount of NaOH to Mn2+ forms a pale brown precipitate
• Add a small amount of NaOH to Mn2+ forms a pale brown precipitate
• [Fe(H2O)6]2+ is a pale green solution
• [Fe(H2O)6]2+ is a pale green solution
• Add a small amount of NaOH to Fe2+ which forms a dark green precipitate
• Add a small amount of NaOH to Fe2+ which forms a dark green precipitate
• [Fe(H2O)6]3+ forms a yellow solution
• [Fe(H2O)6]3+ forms a yellow solution
• Add a small amount of NaOH to Fe3+ which forms an orange brown precipitate
• Add a small amount of NaOH to Fe3+ which forms an orange brown precipitate
• MnO4-/Fe2+ -> Mn2+/Fe3+ purple solution -> pink solution
• MnO4-/Fe2+ -> Mn2+/Fe3+ purple solution -> pink solution