3.25 Formation of products

Question 1

Components in a solution

Answer 1

The solution is made up of the ions that make up the ionic compound and the ions in water (H+ and OH-)

Question 2

Products at the cathode

Answer 2

Hydrogen is produced unless the ions in the ionic compound are from a metal which is less reactive than hydrogen
If the metal is less reactive, the metal will be produced instead

Question 3

Products at the anode

Answer 3

Oxygen is produced unless the ions in the ionic compound contain halide ions (halogens)

If there are halide ions, the halogen will be produced instead.

Question 4

Products in copper chloride

Answer 4

Cu+ ions go to the cathode and copper is produced
Cl- ions go to the anode and chlorine is produced

Question 5

Products in sodium chloride

Answer 5

H+ ions go to the cathode and hydrogen is produced since sodium is more reactive than hydrogen
Cl- ions go to the anode and chlorine is produced

Question 6

Products in sodium sulfate

Answer 6

H+ ions go to the cathode
OH- ions go to the anode since SO4^2- are not halide ions

Question 7

Water acidified with sulfuric acid

Answer 7

H+ ions go to the cathode
OH- ions go to the cathode

Question 8

Molten lead bromide

Answer 8

Pb^2+ go to the cathode and lead is produced
Br- go to the anode and bromine is produced