Transition Metals

• Cu2+ in solution : blue solution [Cu(H2O)6] 2+(aq)
• Cu2+ reaction with OH-(aq): blue precipitate Cu(OH)2(s)
• Cu2+ reaction with excess OH-(aq): insoluble
• Cu2+ reaction with excess NH3(aq): dark blue solution [Cu(NH3)4(H2O)2] 2+ (aq)
• Cu2+ reaction with conc. HCl(aq): yellow solution [CuCl4] 2-(aq)
• Mn2+ in solution: very pale pink solution [Mn(H2O)6] 2+(aq)
• Mn2+ reaction with OH-(aq): light brown precipitate Mn(OH)2(s)
• Mn2+ if left standing in air(O2): dark brown precipitate (darkens), oxidises to Mn(OH)3(s)
• Mn2+ reaction with excess OH-(aq): insoluble
• Mn2+ reaction with NH3(aq): light brown precipitate Mn(OH)2(s)
• Mn2+ reaction with excess NH3(aq): insoluble
• Fe2+ in solution: pale green solution [Fe(H2O)6] 2+(aq)
• Fe2+ reaction with OH-(aq): green precipitate Fe(OH)2(s)
• Fe2+ if left standing in air(O2): darkens to orange-brown precipitate, oxidises to Fe(OH)3(s)
• Fe2+ reaction with excess OH-(aq): insoluble
• Fe2+ reaction with NH3(aq): green precipitate Fe(OH)2(s)
• Fe2+ reaction with excess NH3(aq): insoluble
• Fe3+ in solution: pale yellow solution [Fe(H2O)6] 3+(aq)
• Fe3+ reaction with OH-(aq): Fe(OH)3(s) orange-brown precipitate
• Fe3+ reaction with excess OH-(aq): insoluble
• Fe3+ reaction with NH3(aq): orange-brown precipitate Fe(OH)3(s)
• Fe3+ reaction with excess NH3(aq): insoluble
• Cr3+ in solution: violet solution (pure) [Cr(H2O)6] 3+ (aq), green solution [Cr(H2O)5SO4] + (aq)
• Cr3+ reaction with OH-(aq): grey-green precipitate Cr(OH)3(s)
• Cr3+ reaction with excess OH-(aq): dark green solution [Cr(OH)6] 3-(aq)
• Cr3+ reaction with NH3(aq): grey-green precipitate Cr(OH)3(s)
• Cr3+ reaction with excess NH3(aq): purple solution [Cr(NH3)6] 3+(aq)
• Colour of MnO4-: deep purple solution
• Colour of Cr2O7 2-: orange solution
• Colour of CrO4 2-: yellow solution
• Colour of Cr2+: pale blue solution
• Colour of CuI(s): white precipitate
• Colour of I2(aq): brown solution (blue/black with startch)