Redox couples

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John_Richey_4A
Posts: 69
Joined: Fri Sep 28, 2018 12:27 am

Redox couples

Postby John_Richey_4A » Tue Feb 26, 2019 12:34 pm

When looking at a pair of redox couples how are we supposed to know which one is the reducing agent and which one will be the oxidizing agent in the overall reaction?

Cody Do 2F
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: Redox couples

Postby Cody Do 2F » Tue Feb 26, 2019 12:38 pm

The reducing agent is the one who reduces another element while the oxidizing agent is the one who oxidizes another element. In order to reduce another element, the reducing agent must itself be oxidized. Likewise, in order to oxidize another element, the oxidizing element must itself be reduced.

John_Richey_4A
Posts: 69
Joined: Fri Sep 28, 2018 12:27 am

Re: Redox couples

Postby John_Richey_4A » Tue Feb 26, 2019 12:50 pm

That is the definition of reduction and oxidation, but doesn't answer my question. When looking at, for example, Ti3+/Ti, and Co2+/Co, how are we supposed to know which one will be the reducing agent and which one will be the oxidizing agent?

hanna_maillard3B
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

Re: Redox couples

Postby hanna_maillard3B » Tue Feb 26, 2019 12:54 pm

the reducing agent is the one that loses an electron during the reaction. the oxidizing agent is the one that gains an electron.
so if Fe2+ --> Fe3+, then it loses an electron because it becomes more positive, so it would be the reducing agent.


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