Balancing Redox Reactions

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Shannon Asay 1C
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Joined: Fri Aug 09, 2019 12:16 am

Balancing Redox Reactions

Postby Shannon Asay 1C » Sat Feb 29, 2020 2:08 pm

What are the steps to balance a redox reaction in acidic or basic solution?

205405339
Posts: 77
Joined: Thu Jul 11, 2019 12:16 am

Re: Balancing Redox Reactions

Postby 205405339 » Sat Feb 29, 2020 2:13 pm

you balance reactions in acidic solutions by adding H2O to balance the oxygen and adding H+ to balance hydrogen. In basic solutions, you add H2O to balance the oxygens then to balance the hydrogen, you add H2O to the side needing the hydrogen then add OH- to the other side

Janet Nguy 2C
Posts: 115
Joined: Sat Aug 24, 2019 12:17 am

Re: Balancing Redox Reactions

Postby Janet Nguy 2C » Sat Feb 29, 2020 4:03 pm

Here is a general flowchart for balancing redox reactions in acidic/basic solution:

Both types of situations start the same way:

1. determine the oxidation and reduction half reactions.
2. Balance both half reactions:
a) Balance elements other than H or O
b) Balance O elements by adding H2O molecules to match the number of O molecules you have.
c) Balance H elements by adding H+ (aq)
d) Balance the overall charge on both sides by adding electrons to the more positive side.
e) Combine both of the balanced half rxns (make sure the # of electrons in the half rxns match before you do this). Cancel any electrons or molecules that appear on both sides.

--- stop here for acidic solution ---

3. For basic solution:
f) add OH- molecules to cancel all H+ molecules (these will turn into H2O molecules instead).

Nicholas_Gladkov_2J
Posts: 125
Joined: Sat Aug 17, 2019 12:17 am

Re: Balancing Redox Reactions

Postby Nicholas_Gladkov_2J » Sat Feb 29, 2020 9:09 pm

Shannon Asay 1C wrote:What are the steps to balance a redox reaction in acidic or basic solution?


For balancing redox reactions, you first will first find the oxidation half reaction (loss of e-) and the reduction half reaction (gain of e-).

For each you will then balance:
When an oxygen is needed, you will add an H20.
When a hydrogen is needed, you will add a H+ to the side that needs the H+, but you will also add a OH- to BOTH sides for each H+ added.


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