Test-tube reactions to identify metal ions in aqueous solution

Question 1

What is the colour of Fe2+ in solution

Answer 1

Pale-green

Question 2

What is the colour of Cu2+ in solution

Answer 2

Blue

Question 3

What is the colour of Fe3+ in solution

Answer 3

Yellow/orange

Question 4

What is the colour of Al3+ in solution

Answer 4

Colourless

Question 5

Effect of adding NaOH(aq) until in excess to Fe2+

Answer 5

Green ppt, insoluble in excess (can go brown due to oxidation in air)

Question 6

Effect of adding NaOH(aq) until in excess to Cu2+

Answer 6

Blue ppt, insoluble in excess reagent

Question 7

Effect of adding NaOH(aq) until in excess to Fe3+

Answer 7

Brown ppt insoluble in excess reagent

Question 8

Effect of adding NaOH(aq) until in excess to Al3+

Answer 8

White ppt that dissolves in excess to form a colourless solution

Question 9

Effect of adding NH3(aq) until in excess to Fe2+

Answer 9

Green ppt, insoluble in excess (can go brown due to oxidation in air)

Question 10

Effect of adding NH3(aq) until in excess to Cu2+

Answer 10

Blue ppt that dissolves in excess form a DEEP blue solution

Question 11

Effect of adding NH3(aq) until in excess to Fe3+

Answer 11

Brown ppt insoluble in excess reagent

Question 12

Effect of adding NH3(aq) until in excess to Al3+

Answer 12

White ppt, insoluble in excess

Question 13

Effect of adding Na2CO3(aq) until in excess to Fe2+

Answer 13

Green ppt

Question 14

Effect of adding Na2CO3(aq) until in excess to Cu2+

Answer 14

Blue-green ppt

Question 15

Effect of adding Na2CO3(aq) until in excess to Fe3+

Answer 15

Brown ppt and effervescence

Question 16

Effect of adding Na2CO3(aq) until in excess to Al3+

Answer 16

White ppt and effervescence