Show the partial equation of standardization of #K^(+)MnO_4^(-)# by #"oxalic acid"#?

1 Answer
May 15, 2018

Oxalic acid is oxidized to #CO_2(g)#...

Explanation:

#HO(O=)stackrel(+III)C-C(=O)OH rarr2CO_2(g)+2H^+ +2e^(-)#

And permanganate is reduced to #Mn^(2+)#:

#MnO_4^(-) + 8H^+ +5e^(-) rarr Mn^(2+) + 4H_2O#

We take FIVE of the former, and add this to TWO of the latter...

#5HO(O=)stackrel(+III)C-C(=O)OH+2MnO_4^(-) + 16H^+ +10e^(-) rarr10CO_2(g)+10H^+ +2Mn^(2+) + 8H_2O+10e^(-)#

And we cancel common reagents...

#5HO(O=)stackrel(+III)C-C(=O)OH+2MnO_4^(-) + 6H^+ rarr 2Mn^(2+) + 10CO_2(g)+ 8H_2O#

What colour change is observed in the reaction...?