Electrolysis of Molten Binary Ionic Compounds

In the electrolysis of a molten binary ionic compound, what determines which ion migrates towards the cathode?

During the electrolysis of molten lead(II) bromide, which of the following observations would confirm that lead is being produced at the cathode?

Why is it essential to heat lead(II) bromide until it is molten before electrolysis can occur?

In the electrolysis of molten lead(II) bromide, what is the role of bromide ions at the anode?

If a binary ionic compound other than lead(II) bromide undergoes electrolysis, which statement accurately predicts the products formed?

Binary ionic compound

Electrolysis of lead(II) bromide

Electrolysis of Molten Binary Ionic Compounds

Binary ionic compounds are compounds formed by the ionic bonding of two elements. Examples include lead(II) bromide.
When heated above their melting point, these compounds become molten, allowing their ions to move freely, enabling electrical conductivity.
During electrolysis, molten compounds always produce their constituent elements.

Identifying Products

To predict products, identify the ions present in the compound.
At the cathode (negative electrode), the positive ion is reduced (gains electrons) to form the metal.
At the anode (positive electrode), the negative ion is oxidized (loses electrons) to form the non-metal.

Electrolysis of Lead(II) Bromide

Method:
- Place lead(II) bromide in a crucible and heat until molten.
- Insert two graphite electrodes into the molten compound.
- Connect to a power supply.
- Observe electrolysis.
Anode Reactions (Positive Electrode):
- Bromide ions (Br⁻) migrate to the anode.
- Each bromide ion loses two electrons to form a bromine molecule (Br₂).
- Brown bromine gas is produced at the anode.
Cathode Reactions (Negative Electrode):
- Lead ions (Pb²⁺) migrate to the cathode.
- Each lead ion gains two electrons to form a lead atom (Pb).
- Grey solid lead metal is deposited on the cathode.

Explore the electrolysis of molten binary ionic compounds, focusing on identifying products at the cathode and anode. Molten compounds, such as lead(II) bromide, conduct electricity, producing constituent elements during electrolysis. Learn about the reactions at each electrode.