RP11

• Co2+

  • Add NaOH: Pale pink precipitate forms: Co(OH)2
  • Add excess NH3: Pale brown solution forms: [Co(NH3)6]2+
  • Add HCl: Blue solution forms: [Co(Cl)4]2-
  • Add Na2CO3: Purple precipitate forms: CoCO3
• Fe3+

  • Add NaOH: Brown precipitate forms: Fe(OH)3
  • Add exess NH3: Brown precipitate forms: Fe(OH)3 & effervescence: (CO2)
  • Add HCl: Yellow solution forms: [Fe(Cl)4]-
  • Add Na2CO3: brown ppt Fe(OH3)and effervescence CO2
• Cu2+

  • Add NaOH: Pale blue precipitate forms: Cu(OH)2
  • Add excess NH3: deep blue solution forms: [Co(NH3)4(H2O)2]2+
  • Add HCl: green solution forms: [Cu(Cl)4]2-
  • Add Na2CO3: blue-green precipitate forms: CuCO3
• Fe2+

  • Add NaOH: green precipitate forms: Fe(OH)2
  • Add excess NH3: green ppt forms: [Fe(OH)2]
  • Add HCl: yellow solution forms: [Fe(Cl4)]2-
  • Add Na2CO3: green precipitate forms: FeCO3