Thread: Stoichiometry #2

We did a titration with Hydrogen Peroxide and Potassium Permanganate
2KMnO4 +5 H2O2 + 3H2SO4 → 2MnSO4 + 8H2O + K2SO4 + 5O2
0.0200 mol L-1 potassium permanganate solution was used, with an average titration of 24.885mL
3%w/v Hydrogen Peroxide was diluted to a factor of 1:20, to make a 200mL solution of diluted H2O2. 20mL of this solution was added to a beaker with 10mL sulfuric acid, and the potassium permanganate was titrated until end point was achieved.
Find the %weight/volume of Hydrogen Peroxide
I know it has to be approximately 3, but we just need to show how accurate our practical was.
Thanks in advance =]

When you say "3%w/v Hydrogen Peroxide was diluted to a factor of 1:20" a few questions come to mind. First of all, 3% w/v, is that the molarity of the given solution? Secondly, when you are asking at the end of the question for the %Weight/Volume of the H2O2, are you asking for the diluted solution, or the solution that was not diluted?

Try posting this problem in the chemistry forum.