Electrolysis of Aqueous Solutions

Question 1

Aqueos solutions electrolysis?

Answer 1

• Dissolved in water.
• Water molecules ionise (split) forming hydrogen and hydroxide ions.
• ## Oxygen is usually produced at the anode.

Question 2

What happens if the metal is more reactive than hydrogen?

Answer 2

• Hydrogen is produced at the cathode if metal is more reactive than hydrogen.

Question 3

What happens if the metals is less reactive than hydrogen?

Answer 3

• Metal is discharged at the cathode.

Question 4

Why is platinum used as the electrodes?

Answer 4

Inert.

• Unreactive.
• 1

Question 5

What happens if the aqeuos solution contains halide ions?

Answer 5

• Then the halogen would be produced at the anode.

Question 6

What is the half equation?

Answer 6

Cathode:
H+ + e- –> H. (Reduction).
- Double this equation to show H2.

Andode:

• Ch- —> Ch + e-
• Double this equation to show a molecule.

Answer 7

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