Electrolysis of Aqueous Solutions | GCSE Chemistry Practice
In aqueous solutions, water molecules also ionise, complicating the products of electrolysis.
When is hydrogen produced at the cathode instead of the metal?
What is Electrolysis of Aqueous Solutions | Practice?
"The electrolysis of ionic compounds dissolved in water, where H+ and OH- ions also participate."
Which of these metals is the MOST reactive?
Zinc is extracted from its ore by heating with carbon. This is because...
Which of these metals will NOT react with dilute acid?
In electrolysis, where do the positive ions (cations) move to?
Aqueous Rules
Cathode: Hydrogen is produced if the metal is MORE reactive than hydrogen.
Anode: Oxygen is produced unless halide ions (Cl-, Br-, I-) are present.
Water ionises into H+ and OH- ions.
Used in the industrial production of chlorine and hydrogen.
Rule of Thumb: If you see "sulfate" or "nitrate", assume oxygen is produced at the anode.
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