Reactions of aqueous ions
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24 Terms
what colour is [Fe(H2O)6]2+ (aq)?
green solution
[Fe(H2O)6]2+ (aq) + some OH- colour and equation
deprotonation/hydrolysis
green solution → green ppt (goes brown on standing in air)
[Fe(H2O)6]2+ (aq) + 2OH- → [Fe(H2O)4(OH)2] (s) + 2H2O (l)
[Fe(H2O)6]2+ (aq) + XS OH- colour and equation
no further change
[Fe(H2O)6]2+ (aq) + some NH3 colour and equation
deprotonation/hydrolysis
green solution → green ppt (goes brown on standing in air)
[Fe(H2O)6]2+ (aq) + 2NH3 → [Fe(H2O)4(OH)2] (s) + 2NH4+
[Fe(H2O)6]2+ (aq) + XS NH3 colour and equation
no further change
[Fe(H2O)6]2+ (aq) + CO32- colour and equation
ligand substitution
green solution → green ppt
[Fe(H2O)6]2+ (aq) + CO32- → FeCO3 (s) + 6H2O (l)
what colour is [Cu(H2O)6]2+ (aq)?
blue solution
[Cu(H2O)6]2+ (aq) + some OH- colour and equation
deprotonation/hydrolysis
blue solution → blue ppt
[Cu(H2O)6]2+ (aq) + 2OH- → [Cu(H2O)4(OH)2] (s) + 2H2O (l)
[Cu(H2O)6]2+ (aq) + XS OH- colour and equation
no further change
[Cu(H2O)6]2+ (aq) + some NH3 colour and equation
deprotonation/hydrolysis
blue solution → blue ppt
[Cu(H2O)6]2+ (aq) + 2NH3 → [Cu(H2O)4(OH)2] (s) + 2NH4+
[Cu(H2O)6]2+ (aq) + XS NH3 colour and equation
ligand substitution
blue solution → deep blue solution
[Cu(H2O)6]2+ (aq) + 4NH3 → [Cu(H2O)2(NH3)4]2+ (aq) + 2H2O + 2OH-
[Cu(H2O)6]2+ (aq) + CO32- colour and equation
ligand substitution
blue solution → blue-green ppt
[Cu(H2O)6]2+ (aq) + CO32- → CuCO3 (s) + 6H2O (l)
what colour is [Fe(H2O)6]3+ (aq)
purple solution but may look yellow-brown due to some [Fe(H2O)5(OH)]2+ (aq)
[Fe(H2O)6]3+ (aq) + some OH- colour and equation
deprotonation/hydrolysis
purple solution → brown ppt (may look orange-brown)
[Fe(H2O)6]3+ (aq) + 3OH- → [Fe(H2O)3(OH)3] (s) + 3H2O (l)
[Fe(H2O)6]3+ (aq) + XS OH- colour and equation
no further change
[Fe(H2O)6]3+ (aq) + some NH3 colour and equation
deprotonation/hydrolysis
purple solution → brown ppt (orange-brown)
[Fe(H2O)6]3+ (aq) + 3NH3 → [Fe(H2O)3(OH)3] (s) + 3NH4+
[Fe(H2O)6]3+ (aq) + XS NH3 colour and equation
no further change
[Fe(H2O)6]3+ (aq) + CO32- colour and equation
deprotonation/hydrolysis
purple solution → brown ppt (can look orange-brown) and CO2 gas evolved
2[Fe(H2O)6]3+ (aq) + 3CO32- → 2[Fe(H2O)3(OH)3] (s) + 3H2O + 3CO2
what colour is [Al(H2O)6]3+ (aq)
colourless solution
[Al(H2O)6]3+ (aq) + some OH- colour and equation
deprotonation/hydrolysis
colourless solution → white ppt
[Al(H2O)6]3+ (aq) + 3OH- → [Al(H2O)3(OH)3] (s) + 3H2O (l)
[Al(H2O)6]3+ (aq) + XS OH- colour and equation
hydrolysis/deprotonation
white ppt dissolves into colourless solution
[Al(H2O)6] + 4OH- → [Al(OH)4]- (aq) + 6H2O (l)
[Al(H2O)3(OH)3] + OH- → [Al(H2O)2(OH)4]- (aq) + H2O (l)
[Al(H2O)6]3+ (aq) + some NH3 colour and equation
deprotonation/hydrolysis
colourless solution → white ppt
[Al(H2O)6]3+ (aq) + 3NH3 → [Al(H2O)3(OH)3] (s) + 3NH4+
[Al(H2O)6]3+ (aq) + XS NH3 colour and equation
no further change
[Al(H2O)6]3+ (aq) + CO32- colour and equation
deprotonation/hydrolysis
colourless solution → white ppt and CO2 gas evolved
2[Al(H2O)6]3+ (aq) + 3CO32- → 2[Al(H2O)3(OH)3] (s) + 3H2O + 3CO2
Note 
Flashcards (26)