Aqueous Ions

Question 1

Reactions of [Fe(H2O)6]2+ with Na2CO3

Answer 1

[Fe(H2O)6]2+ + CO32- → FeCO3(s) + 6H2O
Green solution -> green precipitate

Question 2

Reactions of [Fe(H2O)6]2+ with NaOH

Answer 2

[Fe(H2O)6]2+ + 2OH- → Fe(H2O)4(OH)2 + 2H2O
green sol -> green ppt

Question 3

Reactions of [Fe(H2O)6]2+ with NH3

Answer 3

[Fe(H2O)6]2+ + 2NH3 à Fe(H2O)4(OH)2 + 2NH4+
green sol -> green ppt

Question 4

Reactions of [Cu(H2O)6]2+ With Na2CO3

Answer 4

[Cu(H2O)6]2+ + CO32- -> CuCO3(s) + 6H2O
blue sol -> blue ppt

Question 5

Reactions of [Cu(H2O)6]2+ With NaOH

Answer 5

[Cu(H2O)6]2+ + 2OH- -> Cu(H2O)4(OH)2 + 2H2O
blue sol -> blue ppt

Question 6

Reactions of [Cu(H2O)6]2+ With NH3

Answer 6

[Cu(H2O)6]2+ + 2NH3 ->Cu(H2O)4(OH)2 + 2NH4+
blue sol -> blue ppt

Question 7

Reactions of [Cu(H2O)6]2+ With excess NH3

Answer 7

[Cu(H2O)6]2+ + 4NH3 ->[Cu(H2O)2(NH3)4]2+ + 4H2
blue sol -> deep blue sol