balancing redox reactions

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marcus lin 1E
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Joined: Fri Sep 28, 2018 12:28 am

balancing redox reactions

Postby marcus lin 1E » Sun Mar 03, 2019 2:42 pm

When writing the half reactions, when do we know to add on H+ or H2O to the equation?

Henry Krasner 1C
Posts: 64
Joined: Fri Sep 28, 2018 12:15 am

Re: balancing redox reactions

Postby Henry Krasner 1C » Sun Mar 03, 2019 2:54 pm

If there is just Hydrogen to be balanced, you just add H+ to the opposite side to set the mol H+ equal on both sides.
If there is Oxygen that needs to be balanced, add H2O to the side with less oxygen to make the oxygen equal, then add H+ to the other side so that balances the Hydrogen added in H2O.

Amar Singh
Posts: 31
Joined: Fri Sep 28, 2018 12:20 am

Re: balancing redox reactions

Postby Amar Singh » Sun Mar 03, 2019 5:44 pm

For balancing O, you will always use H2O. For balancing H+, if its acidic, you add H+. If it is a basic solution, you add H2O to the side needing the H+, and add OH- to the other side to balance it out.

Michael Torres 4I
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Re: balancing redox reactions

Postby Michael Torres 4I » Sun Mar 03, 2019 6:13 pm

You will often need to balance out the oxygen atoms and hydrogen atoms in a half reaction. When you need to do this, you involve H+ and H2O. Specifically, these would be involved in a half reaction within an acidic medium so that OH- might not be included. An appropriate amount of H2O would be added to the side lacking oxygen atoms and H+ would then be added to the side lacking hydrogen atoms.

Lasya Gudipudi 1A
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Joined: Fri Sep 28, 2018 12:15 am

Re: balancing redox reactions

Postby Lasya Gudipudi 1A » Sun Mar 03, 2019 6:34 pm

You use H+ and H20 to balance half reactions in an acidic solution. H20 is used to balance the oxygen atoms while H+ is used to balance the hydrogen ions. It is easier to balance oxygen first, so that you know how many H+ ions you need to balance the equation.

Stevin1H
Posts: 89
Joined: Fri Sep 28, 2018 12:17 am

Re: balancing redox reactions

Postby Stevin1H » Sun Mar 03, 2019 11:14 pm

Typically, you would add H+ when balancing hydrogens in the reaction and H2O when balancing the oxygens in the reaction. Oxygen is usually balanced first and then Hydrogen because the H2O changes the total number of Hydrogens in the reaction as well. After balancing oxygen with H2O, you would now know the total number of hydrogen to add to balance both sides of the reaction.


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