Question 17.4: Determine the oxidation number for carbon in the oxalate ion...

Determine the oxidation number for carbon in the oxalate ion C_2O_4^{2-} :

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C_2O_4^{2-}

-2

  1.   (-2) 4
  2. 2C + (-8) = -2  (the charge on the ion)
  3. 2C = +6

C = +3 (oxidation number for C)

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