The concentration of a hydrogen peroxide solution can be conveniently determined

Question

The concentration of a hydrogen peroxide solution can be conveniently determined by titration against a standardized potassium permanganate solution in an acidic medium. Balance this redox equation (in acidic solution) by inserting coefficients, H^+, and H_2O as needed. (Do not enter the physical states of any of the species.) MnO_4^- + H_2O_2 rightarrow O_2 + Mn^2+ 2MnO_4^- + 5H_2O_2 + 6H^+ rightarrow 5O_2 + 2Mn^2+ + 8H_2O If 34.70 mL of a 0.04652 M KMnO_4 solution are required to completely oxidize 23.00 mL of a H_2O_2 solution, calculate the molarity of the H_2O_2 solution.

Explanation / Answer

b)

find mol of KMnO4 used

MV = 34.7*0.04652 = 1.6142 mmol of KMnO4 used

then

ratio is 2:5

that is

5/2

mmol of H2O2 = 1.6142*5/2 = 4.0355 mmol ofH2O2

[H2O2] = mmol/mL = 4.0355/23 = 0.17545652173 M

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