Balancing disproportionation redox reaction

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SUMMARY

The discussion centers on balancing the disproportionation redox reaction involving chlorine and hydroxide ions: Cl2 + OH- → Cl- + ClO-. The correct balanced equation is Cl2 + 2OH- → Cl- + ClO- + H2O. The user initially attempted to balance the reaction using an incorrect method that resulted in an imbalance of chlorine atoms. The key takeaway is to ensure that both elements and charges are balanced in all half-reactions during the balancing process.

PREREQUISITES
  • Understanding of redox reactions and their balancing techniques.
  • Familiarity with oxidation states and half-reaction method.
  • Knowledge of the role of hydroxide ions in redox reactions.
  • Ability to identify and balance chemical equations.
NEXT STEPS
  • Study the half-reaction method for balancing redox reactions.
  • Learn about oxidation states and how they apply to chlorine compounds.
  • Research common disproportionation reactions in inorganic chemistry.
  • Practice balancing various redox reactions using different methods.
USEFUL FOR

Chemistry students, educators, and anyone studying redox reactions and chemical balancing techniques.

erisedk
Messages
372
Reaction score
7

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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