Redox Reaction

1. Feb 10, 2007

danago

1. The problem statement, all variables and given/known data
Excess acidified potassium permanganate is added dropwise to an ammonium iron(II) sulfate solution. Write an overall redox equation for this process.

2. The attempt at a solution
Well im not really sure what to do. I dont know what products are being formed. What should i do in a situation like this?

2. Feb 10, 2007

Stevedye56

3. Feb 10, 2007

Gokul43201

Staff Emeritus
What is the one thing that you neeed to know about potassium permanganate?

4. Feb 10, 2007

danago

How do i write a balanaced equation though? I dont know what the products are

5. Feb 10, 2007

danago

Its soluble in water?

6. Feb 10, 2007

Gokul43201

Staff Emeritus
Lots of things are soluble in water.

I quote from the first paragraph of the wiki on potassium permanganate:

7. Feb 10, 2007

danago

Ok, so its an oxidising agent, and therefore, itself reduced. I think this is the correct equation for its reduction:

$$MnO_4 ^ - _{(aq)} + 8H^ + _{(aq)} + 5e^ - \to Mn^{2 + } _{(aq)} + 4H_2 O_{(l)}$$

Would i just combine that with the half equation of iron (II) being oxidised to iron (III) ions?

8. Feb 11, 2007

Gokul43201

Staff Emeritus
Yup, you got it!

9. Feb 11, 2007

danago

Ahh ok. Thanks :)