Electrolysis and redox

2 marks · Easy

Explain how the OILRIG mnemonic helps you decide whether a process is oxidation or reduction, using the example of an ion gaining electrons.

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OILRIG stands for 'Oxidation Is Loss, Reduction Is Gain (of electrons)'. If an ion gains electrons, it is reduction according to the mnemonic.

Also accept: The OILRIG mnemonic reminds us that reduction means gaining electrons, so if an ion gains electrons it is reduction.

Common mistakes: Saying loss is reduction.

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Marking points

M1 · 1 mark · States OILRIG stands for 'Oxidation Is Loss, Reduction Is Gain (of electrons)'.

A1 · 1 mark · Applies the mnemonic to show that gaining electrons is reduction.

Worked solution

OILRIG stands for Oxidation Is Loss, Reduction Is Gain (of electrons). If an ion gains electrons, the mnemonic tells us this process is reduction.