Write the balanced half reaction equations and resultingcomplete reactions for:

Question

Write the balanced half reaction equations and resultingcomplete reactions for: a) the standardization of KMnO4 withNa2C2O4 b) the titration of Fe2+ with KMnO4 Show the change in oxidation number for all elements, andlabel the iron ferrous or ferric Write the balanced half reaction equations and resultingcomplete reactions for: a) the standardization of KMnO4 withNa2C2O4 b) the titration of Fe2+ with KMnO4 Show the change in oxidation number for all elements, andlabel the iron ferrous or ferric Show the change in oxidation number for all elements, andlabel the iron ferrous or ferric

Explanation / Answer

(a)   Standardization ofKMnO4 withNa2C2O4             Half reaction equations :      2CO2 +2e- .....................> C2O42-   ................>I     MnO4-   + 8H+ + 5e- ...........>Mn2+ +4H2O    ...................>II      Overall reaction : 2xII -5xI    2MnO4-  + 16H+ + 10e- +5C2O42- ...........>2Mn2+ + 8H2O +   10CO2 + 10e-    (or)     2MnO4-   + 16H+   + 5C2O42-...........> 2Mn2+ +8H2O +   10CO2 ......................................................................... (b)     Titration of Fe2+ withKMnO4                      Half reactions:             Fe3+ +1e-................>  Fe2+ .............>I            MnO4-  + 8H+ + 5e- ...........>Mn2+ +4H2O    ...................>II       Overall reaction : 1xII-5xI        MnO4-   + 8H+ + 5e- + 5Fe2+...........>Mn2+ +4H2O   + 5Fe3+ +5e-                   Mn(VII) changes to Mn(II) & Fe(II)changes to Fe(III)        Fe2+ is ferrous andFe3+ is ferric                   Mn(VII) changes to Mn(II) & Fe(II)changes to Fe(III)        Fe2+ is ferrous andFe3+ is ferric

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