Addition of H3O+ or OH-

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Chris Pleman 3E
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Joined: Thu Jul 27, 2017 3:01 am
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Addition of H3O+ or OH-

Postby Chris Pleman 3E » Sun Feb 18, 2018 5:44 pm

How can we tell when to add H3O+ or OH- when balancing half reactions, and how do we know what side of the equation to add it to?

Danah Albaaj 1I
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Joined: Fri Sep 29, 2017 7:07 am

Re: Addition of H3O+ or OH-

Postby Danah Albaaj 1I » Sun Feb 18, 2018 5:51 pm

You add H+ to reactions in acidic solutions and OH- to reactions in basic solutions. For H+ you add the ion to the oxidizing agent, and for the OH- ion you add it to the reducing agent. From there you make sure they are on opposite sides of the half-reactions so that they will cancel out when adding the two half-reactions to complete the cell.

Scout_2C
Posts: 15
Joined: Fri Sep 29, 2017 7:05 am

Re: Addition of H3O+ or OH-

Postby Scout_2C » Sun Feb 18, 2018 8:14 pm

I think you might be confusing what to add at what point. You add H2O in order to balance out the number of O in a reaction and you either add H+ or OH- depending on what type of solution you're working with and as previously mentioned you do H for acidic solutions and OH of basic ones.

Katie Blann 1E
Posts: 29
Joined: Tue Nov 15, 2016 3:00 am

Re: Addition of H3O+ or OH-

Postby Katie Blann 1E » Sun Feb 18, 2018 8:32 pm

Will the question tell you if it is acidic?

Nora Sharp 1C
Posts: 53
Joined: Sat Jul 22, 2017 3:00 am

Re: Addition of H3O+ or OH-

Postby Nora Sharp 1C » Sun Feb 18, 2018 8:39 pm

Usually, the question should tell you whether the reactions are occurring in a basic or acidic environment.


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