Which one is reducing and which is oxidising?

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SUMMARY

The discussion focuses on identifying oxidizing and reducing agents in half-reaction equations, specifically Co2+ + 2e- → CO (s) and Ag+ + e- → Ag (s). It is established that the half-reaction that loses electrons is oxidized, while the one that gains electrons is reduced. Participants confirm the necessity of using the standard reduction potentials table to determine the direction of electron flow and the respective roles of each half-reaction.

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  • Understanding of oxidation and reduction concepts
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  • Knowledge of standard reduction potentials
  • Basic principles of electrochemistry
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Procrastinate
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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.
 
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Procrastinate said:
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
 
gabriels-horn said:
Remember, lose electrons oxidized, gain electrons reduced

And as a memory aid:

OIL. RIG

Oxidation Is Loss. Reduction Is Gain (of electrons)
 
Procrastinate said:
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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