Loke R.

asked • 05/17/21

Mn{+2} + KIO4 --> MnO4 + *what?*

In class we were tasked with writing a balanced reaction for when Mn2+ reacts with KIO4 to form MnO4-. However, we were only told the resulting substance from the oxidation part of the redox reaction, that MnO4- is formed, not the reduction, i.e. what is formed from the iodine. Apparently the IO4- turns into IO3- but how can we know that's what will happen if we haven't been given that information beforehand? How do we know how many oxygen will be in the resulting ion? How do we know it'll become IO3- and not IO2- or IO or just KI like 3e- + Mn2+ + KIO --> MnO4- + KI or something like that?

1 Expert Answer


Loke R.

How do we know IO3- is the first step in the process?


J.R. S.

It's the first loss of oxygen going from 4 oxygens to 3 oxygens. The oxidation state of I goes from 7+ to 5+. The second step is going from 3 oxygens to 2 oxygens and I goes from 5+ to 3+, etc.


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