Ion electron balancing problem

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SUMMARY

The discussion focuses on the ion electron balancing problem involving the equation Cr2O72- + Fe3+ + H+ → Cr3+ + Fe2+ + H2O. The student initially attempted to balance the equation by determining the oxidation states of the involved species. The oxidation states were identified as -8 for Cr2O72-, +3 for Fe3+, and +1 for H+, leading to a clarification of the balancing process. The conversation emphasizes the importance of correctly identifying oxidation numbers in redox reactions.

PREREQUISITES
  • Understanding of redox reactions
  • Knowledge of oxidation states
  • Familiarity with balancing chemical equations
  • Basic chemistry concepts, particularly involving ions
NEXT STEPS
  • Study the method of balancing redox reactions using half-reactions
  • Learn about the role of oxidation numbers in chemical reactions
  • Explore the use of the ion-electron method for balancing equations
  • Practice with additional examples of balancing complex redox reactions
USEFUL FOR

Chemistry students, educators, and anyone seeking to improve their skills in balancing redox reactions and understanding oxidation states.

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Homework Statement


The problem is given like this "A student unsuccessfully tried to balance the following equation:
Cr2O72-+Fe3++H+→Cr 3+ +Fe 2+ + H2O


Homework Equations





The Attempt at a Solution


First tried to find the oxidation no.
-8 -2 3+ 1+
Cr2O72-+Fe3++H+
 
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1/2" said:
First tried to find the oxidation no.
-8 -2 3+ 1+
Cr2O72-+Fe3++H+

Show how you got -8.
 
Thanks for pointing out my mistake !
 

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