Balancing redox equations using 1/2 reaction method

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Discussion Overview

The discussion revolves around balancing a redox equation using the half-reaction method, specifically the reaction involving lead dioxide (PbO2) and chloride ions (Cl(-)). Participants are attempting to find a balanced equation that includes the correct half-reactions for both oxidation and reduction processes.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant presents an initial attempt at balancing the equation by identifying the reduction half-reaction for lead (Pb) but expresses difficulty in finding the corresponding oxidation half-reaction.
  • Another participant suggests that assigning oxidation numbers to all elements on both sides may help in identifying the second half-reaction.
  • A subsequent participant proposes a potential oxidation half-reaction involving water and chloride ions but receives a negative response regarding its correctness.
  • There is a reiteration of the importance of assigning oxidation numbers to progress in the solution.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the correct half-reactions or the overall balanced equation, indicating that multiple competing views remain regarding the approach to solving the problem.

Contextual Notes

Some participants express uncertainty about the correctness of proposed half-reactions and the assignment of oxidation numbers, highlighting potential limitations in their understanding of the redox balancing process.

veganazi
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Homework Statement


Balance PbO2(s) + Cl(-) → PbCl2(s) + O2(g)

Homework Equations


n/a

The Attempt at a Solution


Pb(4+) + 2e(-) → Pb(2+) and I'm stuck because there's no 2nd reaction.
 
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Yes there is - if you can't see it, assign oxidation numbers to all elements on both sides.
 
Um 2H2O + 2Cl(-) → O2 + 4H(+) + 6e(-)? Is this right?
 
veganazi said:
Um 2H2O + 2Cl(-) → O2 + 4H(+) + 6e(-)? Is this right?

No.

Have you tried to assign oxidation numbers? As long as you will ignore hints you will not move forward.
 

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