Dark brown fumes evolve at the anode in the Electrolysis of molten lead bromide
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Electrolysing molten lead(II) bromide
Nuffield Foundation In association with Nuffield Foundation
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Introduce your students to the study of electrolysis by demonstrating how conduction is only possible where lead(II) bromide is molten.
Demonstration
This experiment demonstrates that conduction is only possible where lead(II) bromide is molten, and that metallic lead and bromine are the products of electrolysis of the molten electrolyte. This is a demonstration that can be done as an introduction to studying electrolysis.
Lesson organisation
This demonstration doesn’t need too much preparation and the apparatus involved is very straightforward. It must be done in a fume cupboard as bromine (VERY TOXIC and CORROSIVE) is produced. A safer alternative may be the Electrolysis of molten zinc chloride . The demonstration takes about 30-40 mins.