[flyer517]

Hi All

I was hoping someone could tell me if I am on the right track with an assignment question.  It is fairly long question but I am just unsure about the first part which is the equation for the reaction of Manganese Dioxide with Potassium Iodide.  This is what I think happens:

MnO₂ + 2KI   MnI₂ + K₂O₂

Is this correct?

Many thanks.

Flyer

PS:  Sorry, updated my post title to be more appropriate.

[Nobby]

Question is schould it takes place in aquaeous solution or bei melting.

Inaquaeus soution:

MnO₂ + 2 H₂O + 2 I^- => Mn²⁺ + 4 OH^- + I₂

If melted I suppose a kind of Manganate-IV or -III will be formed. But never Potassium peroxide.

[DevaDevil]

well, you should in case of redox reactions with inorganic chemicals always try to create half-cell reactions, and maybe check your tables of reduction potentials to see what would be likely to be created.

In your case treat the MnO₂ (which will be reduced) separately from the KI (or I^- in aqueous solution), which will be oxidised.

Make half-cell reactions and you can figure our the products