Lead bromide must be heated until it melts before it can be electrolysed. Why is this necessary?

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Question

Lead bromide must be heated until it melts before it can be electrolysed. Why is this necessary?

Accepted Answer

Melting frees the ions so they can move to the electrodes — Award 1 mark. Conduction in an electrolyte depends on mobile ions, and in the solid lattice the ions are locked in position. The electrons come from the power supply, not from heating.

Answer

The cold solid would react with the graphite electrodes

Answer

Heating supplies the electrons needed for the electrode reactions

Answer

Melting converts the ions into neutral atoms

Answer

Melting frees the ions so they can move to the electrodes

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