3.2.6 Reactions of Ions in Aqueous Solution Flashcards
To recall the colours and reactions of the four metal hexaaqua ions
What coulour is aqueous [Fe(H2O)6]2+
Green solution
What happens to aqueous [Fe(H2O)6]2+ when NaOH is added?
Green solution forms green precipitate
(goes brown on standing in air)
What happens to aqueous [Fe(H2O)6]3+ when NaOH is added?
Brown solution forms brown precipitate
What happens to aqueous [Al(H2O)6]3+ when NaOH is added?
Colourless solution forms white precipitate
What happens to aqueous [Al(H2O)6]3+ when NH3 is added?
Colourless solution forms white precipitate
What happens to aqueous [Al(H2O)6]3+ when excess NaOH is added?
Colourless solution forms white precipitate then the white precipitate dissolves to form a colourless solution
What happens to aqueous [Fe(H2O)6]3+ when NH3 is added?
Brown solution forms brown precipitate
What happens to aqueous [Fe(H2O)6]3+ when Na2CO3 is added?
Brown solution forms brown precipitate and CO2 is released
What happens to aqueous [Al(H2O)6]3+ when Na2CO3 is added?
Colourless solution forms white precipitate and CO2 is released
What happens to aqueous [Fe(H2O)6]3+ when excess NH3 is added?
Brown solution forms brown precipitate
No further change
What happens to aqueous [Fe(H2O)6]3+ when excess NaOH is added?
Brown solution forms brown precipitate
No further change
What happens to aqueous [Cu(H2O)6]2+ when NaOH is added?
Blue solution forms blue precipitate
What happens to aqueous [Cu(H2O)6]2+ when NH3 is added?
Blue solution forms blue precipitate
What happens to aqueous [Cu(H2O)6]2+ when excess NaOH is added?
Blue solution has already formed a blue precipitate
No further change
What happens to aqueous [Fe(H2O)6]2+ when excess NaOH is added?
Green solution has already formed a green precipitate
No further change
What happens to aqueous [Fe(H2O)6]2+ when excess NH3 is added?
Green solution has already formed a green precipitate
No further change
What coulour is aqueous [Cu(H2O)6]2+
Blue solution
What coulour is aqueous [Al(H2O)6]3+
colourless solution
What coulour is aqueous [Fe(H2O)6]3+
Purple solution but looks brown due to some dissociation into
[Fe(H2O)5(OH)]2+
What happens to aqueous [Fe(H2O)6]2+ when NH3 is added?
Green solution forms green precipitate
(goes brown on standing in air)
What happens to aqueous [Fe(H2O)6]2+ when Na2CO3 is added?
Green solution forms a green precipitate of FeCO3
What happens to aqueous [Cu(H2O)6]2+ when HCl is added?
Blue solution forms a yellow-green solution of [CuCl4]2-
What happens to aqueous [Cu(H2O)6]2+ when Na2CO3 is added?
Blue solution forms a blue-green precipitate of CuCO3
What happens to aqueous [Cu(H2O)6]2+ when excess NH3 is added?
Blue solution forms blue precipitate which then forms a deep blue solution
What happens to aqueous [Al(H2O)6]3+ when excess NH3 is added?
Colourless solution forms white precipitate
No further change
