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More Enthalpy, more periodic table and the joy of redox potentials - page 58 / 68

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Balance, multiply and add

These balance to:

SO2 +2H2O SO42- + 2e- + 4H+      And

Cr2O72- + 6e- +14H+ 2Cr3+ + 7H2O

Then you need to get the electrons equal:

3SO2 + 6H2O 3SO42- + 6e- + 12H+

And then add, letting the electrons cancel:

3SO2 + 6H2O + Cr2O72- +14H+ 3SO42- + 12H+ + 2Cr3+ + 7H2O

And we can cancel the water and protons:

3SO2 + Cr2O72- + 2H+ 3SO42- + 2Cr3+ + H2O

And I left out the state symbols on purpose to make it easier ....

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