What are the four stages in electrolysis?
-Electrical circuit has 2 electrodes (often made of inert substance that doesn’t react with the products) that make contact with the electrolyte.
-Ions in electrolyte move to electrodes where they’re discharged to produce elements
-Positively charged ions attracted to neg electrode where they form metal or hydrogen depending on ions in electrode.
-Neg ions attracted to pos electrode where they lose their charge to form non-metallic elements.
i.e. when molten lead bromide is electrolysed: -lead produced at neg electrode, bromine at pos.
Describe the process of electroplating?
The object to be plated is used as the negative electrode.
The positive electrode is made from the plating metal. Electrolyte =solution containing ions of the plating metal.
At positive electrode: atoms of the plating metal lose electrons to form metal ions which go into the solution.
At negative electrode: metal ions from the solution gain electrons to form metal atoms which are deposited on the object to be plated