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Preview of Electrolysis

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During electrolysis:
Positively charged ions move to the
negative electrode during electrolysis.
They receive electrons and are reduced.
Negatively charged ions move to the
positive electrode during electrolysis.
They lose electrons and are oxidised.
At the negative electrode
At the negative electrode, positively charged ions gain electrons. This is
reduction, and you say that the ions have been reduced.
Metal ions and hydrogen ions are positively charged. Whether you get the metal
or hydrogen during electrolysis depends on the position of the metal in the
reactivity series:
the metal will be produced if it is less reactive than hydrogen
hydrogen will be produced if the metal is more reactive than hydrogen
At the positive electrode
At the positive electrode, negatively charged ions
lose electrons. This is oxidation, and you say that
the ions have been oxidised. The table
summarises some of the elements you should
expect to get during electrolysis.
element given off at
positive electrode
negative ion in

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Cl­ chlorine, Cl2
bromide, Br­ bromine, Br2
iodide, I­ iodine, I2
oxygen, O2
sulfate,…read more


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