Which one is reducing and which is oxidising?

[Procrastinate]

When a question with two half equations set out like below, how do I tell which one is oxidising and which one is reducing? Do I have to apply the standard reduction potentials table?

Co²⁺ + 2e- -> CO (s)
Ag⁺ +e- -> Ag (s)

Thank you.

 

[gabriels-horn]

When a question with two half equations set out like below, how do I tell which one is oxidising and which one is reducing? Do I have to apply the standard reduction potentials table?

Co²⁺ + 2e- -> CO (s)
Ag⁺ +e- -> Ag (s)

Thank you.

Remember, lose electrons oxidized, gain electrons reduced

 

[Dadface]

Remember, lose electrons oxidized, gain electrons reduced

And as a memory aid:

OIL. RIG

Oxidation Is Loss. Reduction Is Gain (of electrons)

 

[Borek]

Do I have to apply the standard reduction potentials table?

Assuming you were asked to say what will happen if both half cells are present - yes.

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