Colour

Question 1

Iron (II) ions

Answer 1

Green solution

Question 2

Iron (III) ions

Answer 2

Orange/brown solution

Question 3

Copper (II) ions

Answer 3

Pale blue solution

Question 4

Iron (II) + OH- ion

Answer 4

Green precipitate

Question 5

Iron (III) + OH- ion

Answer 5

Rust-brown precipitate

Question 6

Copper (II) + OH- ion

Answer 6

Blue precipitate

Question 7

Copper (II) + a little NH3

Answer 7

Blue precipitate

Question 8

Copper (II) + a lot of NH3

Answer 8

Intense blue solution

Question 9

Test for a phenol

Answer 9

Iron(III) chloride, goes purple

Question 10

Iron(II) ions and hydroxide reaction

Answer 10

Fe(H20)6 2+ + 2OH- –> Fe(H20)4(OH)2 + 2H20

Question 11

Iron(III) ions and hydroxide reaction

Answer 11

Fe(H20)6 3+ + 3OH- –> Fe(H20)3(OH)3 + 3H20

Question 12

Cu(II) ions and hydroxide reaction

Answer 12

Cu(H20)6 2+ + 2OH- –> Cu(H20)4(OH)2 + 2H20

Question 13

Cu(II) and a little ammonia reaction

Answer 13

Cu(H20)6 2+  +  2NH3  --> Cu(H20)4(OH)2  +  2NH4+
Removes protons (H+ ions)

Question 14

Cu(III) and a lot of ammonia reaction

Answer 14

Cu(H20)6 2+ + 4NH3 –> Cu(NH3)4) 2+ + 6H20

The precipitate will dissolve and form an intense blue solution. This is because the NH3 molecules can also act as ligands.