Reactions of metal ions in aqueous solution

Question 1

What is the aqueous ion with iron (II) and its colour?

Answer 1

[Fe(H2O)6]2+ / green solution

Question 2

What is the aqueous ion with iron (III) and its colour?

Answer 2

[Fe(H2O)6]3+ / purple solution

Question 3

Why might the iron (III) aqueous ion change colour - from what to what?

Answer 3

[Fe(H2O)6]3+ / purple solution to [Fe(H2O)5(OH)]2+ / yellow-brown

Question 4

What is the aqueous ion with copper (II) and its colour?

Answer 4

[Cu(H2O)6]2+ / blue solution

Question 5

What is the aqueous ion with aluminium (II) and its colour?

Answer 5

[Al(H2O)6]3+ / colourless solution

Question 6

What happens when [Fe(H2O)6]2+ reacts with a little NaOH? Complex and colour?

Answer 6

Fe(H2O)4(OH)2(s) /

green ppt goes brown on standing in air

Question 7

What happens when [Fe(H2O)6]3+ reacts with a little NaOH? Complex and colour?

Answer 7

Fe(H2O)3(OH)3(s) /

brown ppt

Question 8

What happens when [Cu(H2O)6]2+ reacts with a little NaOH? Complex and colour?

Answer 8

Cu(H2O)4(OH)2(s) /

blue ppt

Question 9

What happens when [Al(H2O)6]3+ reacts with a little NaOH? Complex and colour?

Answer 9

Al(H2O)3(OH)3(s) /

white ppt

Question 10

What happens when [Fe(H2O)6]2+ reacts with a little NH3? Complex and colour?

Answer 10

Fe(H2O)4(OH)2(s) /

green ppt goes brown on standing in air

Question 11

What happens when [Fe(H2O)6]3+ reacts with a little NH3? Complex and colour?

Answer 11

Fe(H2O)3(OH)3(s) /

brown ppt

Question 12

What happens when [Cu(H2O)6]2+ reacts with a little NH3? Complex and colour?

Answer 12

Cu(H2O)4(OH)2(s) /

blue ppt

Question 13

What happens when [Al(H2O)6]3+ reacts with a little NH3? Complex and colour?

Answer 13

Al(H2O)3(OH)3(s) /

white ppt

Question 14

What happens when [Fe(H2O)6]2+ reacts with CO3^2-? Complex and colour?

Answer 14

FeCO3(s) /

green ppt

Question 15

What happens when [Fe(H2O)6]3+ reacts with CO3^2-? Complex and colour?

Answer 15

Fe(H2O)3(OH)3(s)
brown ppt
and CO2 gas evolved

Question 16

What happens when [Cu(H2O)6]2+ reacts with CO3^2-? Complex and colour?

Answer 16

CuCO3(s) /

blue-green ppt

Question 17

What happens when [Al(H2O)6]3+ reacts with CO3^2-? Complex and colour?

Answer 17

Al(H2O)3(OH)3(s)
white ppt
and CO2 gas evolved