Question

a 5.000ml aqueous sample containing hydrogen peroxide as diluted to 25ml and analyzed by titration with permanganate.

2MnO4- + 5H2O + 6H+ --> 5O2 + 2Mn^2+ + 8H2O

The sample required 42.8 mL of 0.0175 M permangante to reach the end point. What is the concentration of H2O2 in the original sample?

so,i was trying to do M1V1 = M2V2 but I don't know the volume I would use for the hydrogen peroxide? Or is using that equation wrong...?
I think that using the equation is wrong, but im not 100 percent sure myself i mean im just trying to help as many ppl as i can
Nevermind - I think I see what I did wrong. I was using 25 mL as my volume for hydrogen peroxide, when I should have been using 20 mL since that was the volume being added. Though I don't necessarily understand how that's the volume that needs to be used.

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