Aqueous ions

Question 1

Aqueous Iron (II)

Answer 1

[Fe(H2O)6]2+

Pale Green Solution

Question 2

Aqueous Iron (II)
With OH–

Answer 2

[Fe(H2O)4(OH)2]
Green Precipitate
turns brown on standing

Question 3

Aqueous Iron (II)
With excess OH–

Answer 3

[Fe(H2O)4(OH)2]
Green Precipitate
turns brown

Question 4

Aqueous Iron (II)
With a carbonate

Answer 4

FeCO3

Green Precipitate

Question 5

Aqueous Iron (II)
With NH3

Answer 5

[Fe(H2O)4(OH)2]
Green Precipitate
turns brown on standing

Question 6

Aqueous Iron (II)
With excess NH3

Answer 6

[Fe(H2O)4(OH)2]
Green Precipitate
turns brown on standing

Question 7

Aqueous Copper (II)

Answer 7

[Cu(H2O)6]2+

Blue Solution

Question 8

Aqueous Copper (II) 
With OH–

Answer 8

[Cu(H2O)4(OH)2]

Light Blue Precipitate

Question 9

Aqueous Copper (II) 
With excess OH–

Answer 9

[Cu(H2O)4(OH)2]

Light Blue Precipitate

Question 10

Aqueous Copper (II) 
With NH3

Answer 10

[Cu(H2O)4(OH)2]

Light Blue Precipitate

Question 11

Aqueous Copper (II) 
With excess NH3

Answer 11

[Cu(NH3)4(H2O)2]2+

Deep Blue Solution

Question 12

Aqueous Copper (II) 
With a carbonate

Answer 12

CuCO3

Green/Blue-Green Precipitate

Question 13

Aqueous Aluminium (III)

Answer 13

[Al(H2O)6]3+

Colourless Solution

Question 14

Aqueous Aluminium (III)
With OH–

Answer 14

[Al(H2O)3(OH)3]

White Precipitate

Question 15

Aqueous Aluminium (III)
With excess OH–

Answer 15

[Al(OH)4] – or
[Al(H2O)2(OH)4] –
Or [Al(OH)6] 3–
Colourless Solution

Question 16

Aqueous Aluminium (III)
With NH3

Answer 16

[Al(H2O)3(OH)3]

White Precipitate

Question 17

Aqueous Aluminium (III)
With excess NH3

Answer 17

[Al(H2O)3(OH)3]

White Precipitate

Question 18

Aqueous Aluminium (III)
With a carbonate

Answer 18

[Al(H2O)3(OH)3]
White Precipitate
and effervescence (CO2)

Question 19

Aqueous Iron (III)

Answer 19

[Fe(H2O)6]3+

Yellow/Brown solution due to hydrolysis

Question 20

Aqueous Iron (III) 
With OH–

Answer 20

[Fe(H2O)3(OH)3]

Brown Precipitate

Question 21

Aqueous Iron (III)
 With excess OH–

Answer 21

[Fe(H2O)3(OH)3]

Brown Precipitate

Question 22

Aqueous Iron (III)
With NH3

Answer 22

[Fe(H2O)3(OH)3]

Brown Precipitate

Question 23

Aqueous Iron (III)
With excess NH3

Answer 23

[Fe(H2O)3(OH)3]

Brown Precipitate

Question 24

Aqueous Iron (III)
With a carbonate

Answer 24

[Fe(H2O)3(OH)3]
Brown Precipitate
and effervescence (CO2)

Question 25

Aqueous Cobalt (II)
With NH3

Answer 25

[Co(H2O)4(OH)2]

Blue precipitate

Question 26

Aqueous Cobalt (II)
With excess NH3

Answer 26

[Co(NH3)6]2+

Brown solution that turns yellow on standing to [Co(NH3)6]3+

Question 27

Aqueous Copper (II)
With excess Cl-

Answer 27

[Cu(Cl)4]2-

Yellow solution

Question 28

Cobalt (II) with HCl(aq)

Answer 28

[CoCl4]2–

Blue solution

Question 29

Cobalt(II) with a carbonate

Answer 29

CoCO3

Purple precipitate

Question 30

Aqueous Cobalt(II)

Answer 30

[Co(H2O)6]2+

Pink solution

Question 31

Aqueous Vanadium (V)

Answer 31

[VO2(H2O)4]+

Yellow solution

Question 32

Aqueous Vanadium(IV)

Answer 32

[VO(H2O)5]2+

Blue solution

Question 33

What condition does ammonium vanadate(V) have to be in for zinc to oxidise it?

Answer 33

Acidic

Question 34

Aqueous Vanadium(III)

Answer 34

[V(H2O)6]3+

Green solution

Question 35

Aqueous Vanadium(II)

Answer 35

[V(H2O)6]2+

Purple solution