Electrolysis of Aqueous Solutions Flashcards
All 5 cards in this deck
What are the steps to predict the products of electrolysing an aqueous solution using inert electrodes?
e.g. copper chloride solution- Cathode: the metal is formed if it is less reactive than hydrogen, otherwise hydrogen — copper.
- Anode: the halogen is formed if a halide is present, otherwise oxygen — chlorine.
What are the products of the electrolysis of sodium chloride solution using inert electrodes?
Hydrogen at the cathode and chlorine at the anode.
What is produced at each electrode when water acidified with sulfuric acid is electrolysed, and in what volume ratio?
Hydrogen at the negative electrode and oxygen at the positive electrode, in a 2 : 1 volume ratio (hydrogen is double the volume of oxygen).
How is impure copper purified by electrolysis?
The impure copper is the anode and pure copper the cathode, in copper sulfate solution; copper dissolves from the anode and pure copper is deposited on the cathode.
What are the products of the electrolysis of sodium sulfate solution using inert electrodes?
Hydrogen at the cathode (sodium is more reactive than hydrogen) and oxygen at the anode (no halide ions are present).