3.2.6 - Reaction of Metal Aqua Ions Flashcards
Ions in solution
acidic
Acidic solutions of metal ion that form 2+ ions
weaker than those that form 3+ ions
Reaction between solutions of metal ions and NaOH
form a salt and water in a neutralisation reaction
Equation for reaction between [Fe(H2O)6]2+ and NaOH
[Fe(H2O)6]2+ + 2OH- –> [Fe(H2O)4(OH)2] + 2H2O
Equation for reaction between [Cu(H2O)6]2+ and NaOH
[Cu(H2O)6]2+ + 2OH- –> [Cu(H2O)4(OH)2] + 2H2O
Equation for reaction between [Fe(H2O)6]3+ and NaOH
[Fe(H2O)6]3+ + 3OH- –> [Fe(H2O)3(OH)3] + 3H2O
Equation for reaction between [Al(H2O)6]3+ and NaOH
[Al(H2O)6]3+ + 3OH- –> [Al(H2O)3(OH)3] + 3H2O
Colour of [Fe(H2O)4(OH)2] when NaOH has been added
green solution –> green precipitate
Colour of [Cu(H2O)4(OH)2] when NaOH has been added
blue solution –> blue precipitate
Colour of [Fe(H2O)3(OH)3] when NaOH has been added
orange solution –> brown precipitate
Colour of [Al(H2O)3(OH)3] when NaOH has been added
colourless solution –> white precipitate
Equation for addition of H3O+ to [Al(H2O)3(OH)3] when NaOH has been added
[Al(H2O)3(OH)3] –> [Al(H2O)6]3+
Equation for addition of OH- to [Al(H2O)3(OH)3] when NaOH has been added
[Al(H2O)3(OH)3] –> [Al(H2O)2(OH)4]-
Reaction between solutions of metal ions and aqueous ammonia
form a salt and ammonium ions
Equation for reaction between [Fe(H2O)6]2+ and NH3
[Fe(H2O)6]2+ + 2NH3 –> [Fe(H2O)4(OH)2] + 2NH4+
Equation for reaction between [Cu(H2O)6]2+ and NH3
[Cu(H2O)6]2+ + 2NH3 –> [Cu(H2O)4(OH)2] + 2NH4+
Equation for reaction between [Fe(H2O)6]3+ and NH3
[Fe(H2O)6]3+ + 3NH3 –> [Fe(H2O)3(OH)3] + 3NH4+