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Balancing Redox Equations. Many redox reactions are too complex to simply balance by inspection  we must ensure that the e- lost and gained balance There are 2 methods to balance redox rxn: Half reaction Using oxidation numbers. Half Rxn Method. We’ll balance:

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balancing redox equations
Balancing Redox Equations
  • Many redox reactions are too complex to simply balance by inspection  we must ensure that the e- lost and gained balance
  • There are 2 methods to balance redox rxn:
    • Half reaction
    • Using oxidation numbers
half rxn method
Half Rxn Method

We’ll balance:

Sn + HNO3 SnO2 + NO2 + H2O

  • Step 1: Assign oxidation numbers to each element to identify which is oxidized and which is reduced.
slide3

Step 2: write the half rxn, using only elements that change in oxidation number. Then add e- to balance the charges.

slide5

Step 4: Transfer the coefficients into the original reaction.

  • Step 5: Balance the remaining elements by inspection.
  • Step 6: Check the equation to see that it is balanced.
slide6

Balance the equation

I2 + Cl2 + H2O  HIO3 + HCl

slide8

Balance

K2Cr2O7 + FeCl2 + HCl  CrCl3 + KCl + FeCl3 + H2O

balancing acid base solutions
Balancing Acid/Base Solutions
  • We follow the same steps as before, but leave the H and O until the end, and then balance by adding H+, OH- or H2O according to:
  • In acid solutions, we add H+ and H2O as needed
  • In basic solutions we add OH- and H2O as needed