Balancing disproportionation redox reaction

AI Thread Summary
The discussion focuses on balancing the disproportionation redox reaction of chlorine and hydroxide ions. The initial attempt incorrectly resulted in a net reaction with an imbalance of chlorine atoms. The correct balanced equation is Cl2 + 2OH- → Cl- + ClO- + H2O, which maintains the proper count of chlorine atoms. Participants emphasize the importance of checking both element and charge balance in redox reactions. The conversation highlights common pitfalls in balancing redox reactions and the need for careful verification of each component.
erisedk
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Homework Statement


Complete and balance the following reaction:
Cl2 + OH- → Cl- + ClO-

Homework Equations

The Attempt at a Solution


So, I did it like any other redox:
Cl2 + 2e- → 2Cl-
2Cl2 + 4OH- → 2ClO- + 2H2O + 2e-

Net reaction: 3Cl2 + 4OH- → 2Cl- + 2ClO- + 2H2O

However, the answer is Cl2 + 2OH- → Cl- + ClO- + H2O

So I googled and found this: https://answers.yahoo.com/question/index?qid=20090410003712AApVw5v
But why is my method wrong?
 
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The reaction you propose has six chlorine atoms on the left, but only four on the right.
 
erisedk said:
2Cl2 + 4OH- → 2ClO- + 2H2O + 2e-

If in doubt, check if elements and charge are balanced in all reactions and half reactions.
 
Sorry! I balanced and rechecked everything besides Cl itself.
Thanks!
 

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