# Homework Help: 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 :)