Electrolysis

Question 1

Acidified water

Answer 1

Cathode: 2H+ + 2e- = H2
Anode: H2O = 2H+ + 1/2O2 + 2e-

Question 2

Sodium Sulfate

Answer 2

Anode: 2H2O= O2 + 4H+ + 4e-
Cathode: 2H2O + 2e- = H2 + 2OH-

Question 3

Potassium iodide

Answer 3

Anode: 2I- = I2 + 2e-
Cathode: 2H2O + 2e- = H2 + 2OH-

Question 4

Copper sulfate

Answer 4

Cathode: Cu2+ + 2e- = Cu>
Anode: Cu = Cu2+ + 2e-