The Notes: What are the ionic equations for the reaction of permanganate with Fe2+?

Tuesday, May 12, 2015

What are the ionic equations for the reaction of permanganate with Fe2+?

The reaction of permanganate with Fe2+ is an oxidation-reduction reaction, since permanganate is an oxidizing agent. Hence, Fe2+ will get oxidized, while the permanganate will get reduced.

The oxidation reaction can be written as:

$\displaystyle{F}{{e}}^{{{2}+}}\to{F}{{e}}^{{{3}+}}+{{e}}^{{-{}}}$

Here, Fe2+ oxidizes to Fe3+ and thus its oxidation number changes from +2 to +3.

The reduction reaction can be written as:

$\displaystyle{M}{n}{{O}_{{4}}^{{-}}}\to{M}{{n}}^{{{2}+}}$

Here, the oxidation number of Mn changes from +7 to +2 and it gets reduced. The balanced chemical reaction for reduction can be written as:

$\displaystyle{M}{n}{{O}_{{4}}^{{-}}}+{8}{{H}}^{{+}}+{5}{{e}}^{{-}}\to{M}{{n}}^{{{2}+}}+{4}{H}_{{2}}{O}$

The overall chemical reaction can be written by combining the equations for oxidation and reduction (in such a way that the electrons balance out) as:

$\displaystyle{5}{F}{{e}}^{{{2}+}}+{M}{n}{{O}_{{4}}^{{-}}}+{8}{{H}}^{{+}}\to{5}{F}{{e}}^{{{3}+}}+{M}{{n}}^{{{2}+}}+{4}{H}_{{2}}{O}$

Hope this helps.

The Notes

Tuesday, May 12, 2015

What are the ionic equations for the reaction of permanganate with Fe2+?

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