[Kilian]

We are doing a lab in my AP chemistry class, and one of the questions is:
If 26.23 mL of potassium permanganate solution is required to titrate 1.041 g of ferrous ammonium sulfate hexahydrate, FeSO4(NH4)2SO4*6H2O, calculate the molarity of the KMnO4 solution.
I'm having difficulty understanding how to get the mol of KMnO4 to find out the molarity. If anyone could help id be grateful!

[AWK]

Write down a balance equation first.

[IITian]

1. First of all, you need to write the balanced chemical equation, which should be provided.  If not, it is a simple redox reaction involving the Mn and Fe ions. The half reactions are:

Fe2+ -->  Fe3+ + e-

MnO4- + 8H+ + 5e- --> Mn2+ + 4H2O

From that, balance the total redox reaction.  Then, find your moles of iron, and use that with the stoichiometry from the balanced reaction to find the moles of potassium permanganate. Then, divide the moles of the potassium permanganate by your volume (convert to liters).