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Questions and Answers
In the electrolysis of a molten binary ionic compound, what determines which ion migrates towards the cathode?
In the electrolysis of a molten binary ionic compound, what determines which ion migrates towards the cathode?
- The charge of the ion. (correct)
- The size of the ion.
- The mass of the ion.
- The concentration of the ion.
During the electrolysis of molten lead(II) bromide, which of the following observations would confirm that lead is being produced at 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?
- Increase in the solution's temperature.
- Bubbling of a colorless gas.
- Formation of a grey solid deposit. (correct)
- Formation of a brown gas.
Why is it essential to heat lead(II) bromide until it is molten before electrolysis can occur?
Why is it essential to heat lead(II) bromide until it is molten before electrolysis can occur?
- To allow the ions to move freely and conduct electricity. (correct)
- To prevent the graphite electrodes from reacting.
- To increase the electrical conductivity of the electrodes.
- To lower the melting point of the lead(II) bromide.
In the electrolysis of molten lead(II) bromide, what is the role of bromide ions at the anode?
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?
If a binary ionic compound other than lead(II) bromide undergoes electrolysis, which statement accurately predicts the products formed?
Flashcards
Binary ionic compound
Binary ionic compound
Compounds made of two elements joined by ionic bonds.
Electrolysis
Electrolysis
Process of using electricity to break down molten ionic compounds.
Cathode product
Cathode product
The metal produced at the cathode during electrolysis.
Anode product
Anode product
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Electrolysis of lead(II) bromide
Electrolysis of lead(II) bromide
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Study Notes
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.
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