CH-1711
Electrolysis of solutions
Chemistry · Secondary 4 · Medium · Electrolysis of solutions
During electroplating, a spoon is coated with copper using an aqueous solution of copper(II) sulfate and inert electrodes. After 20 minutes, the mass of the spoon increases from 12.4 g to 13.1 g. Which process at the spoon explains this increase in mass?
- a gas being produced at the spoon
- a copper salt being formed on the spoon
- oxidation of copper metal on the spoon
- reduction of copper ions onto the spoon
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