Summary Reactions of ions in aqueous solution

Metal Aqueous ion NaOH dropwise Excess NaOH NH3 dropwise Excess NH3 Na2CO3



Iron (II) [Fe(H2O)6]2+aq Fe(H2O)6(OH)2 (S) Fe(H2O)4(OH)2 (S) FeCO3 (S)

Green ppt goes No further change Green ppt goes No further change
brown on standing brown on standing
Green solution in air in air Green ppt
Copper (II) [Cu(H2O)6]2+aq Cu(H2O)6(OH)2 (S) Cu(H2O)4(OH)2 (S) [Cu(H2O)2(NH3)4]2+(aq) CuCO3 (S)
No further change
Blue solution Blue ppt Blue ppt Deep blue solution Blue – green ppt
Iron (III) [Fe(H2O)6]3+aq Fe(H2O)3(OH)3 (S) Fe(H2O)3(OH)3 (S) Fe(H2O)3(OH)3 (S)
No further change No further change
Brown ppt and
Brown solution Brown ppt Brown ppt CO2 gas produced
Aluminium (III) [Al(H2O)6]3+aq Al(H2O)3(OH)3 (S) -
[Al(OH)4] OR Al(H2O)3(OH)3 (S) Al(H2O)3(OH)3 (S)
[Al(OH)6]3- No further change
Colourless solution White ppt and CO2
White ppt Colourless White ppt gas produced
solution