C3.4.2 - Electrolysis of solutions

Question 1

What are inert electrodes?

Answer 1

Unreactive electrodes that do not change during electrolysis

Question 2

What are the rules for electrolysis?

Answer 2

• Hydrogen is produced at the cathode but if ions from a less reactive metal than hydrogen is present, it will be produced instead
• Oxygen is produced at the anode but if ions from Group 7 are present at a high enough concentration then the Group 7 element is produced instead

Question 3

What does an aqueous solution contain?

Answer 3

Ions from a dissolved ionic compound