Question

A solution of hydrogen peroxide, H2O2 , is titrated with potassium permanganate, KMnO4 , according to...

A solution of hydrogen peroxide, H2O2 , is titrated with potassium permanganate, KMnO4 , according to the following equation:

5 H2O2 + 2 KMnO4+ 3H2SO4 -> 5O2 + 2 MnSO4 +8H2O + K2SO4

It requires 46.9mL of 0.145 mol/L KMnO4 to titrate 50.0 mL of the solution of H2O2 .

What is the moles per litre concentration of H2O2 in the solution?

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Answer #1

volume of KMnO4 = 46.9 mL

Molarity = 0.145 mol / L

moles of KMnO4 = 46.9 x 0.145 / 1000 = 6.8 x 10^-3 mol

from the balanced equation :

5 mol H2O2    ---------------> 2 mol KMnO4

    ??              ---------------> 6.8 x 10^-3 mol KMnO4

moles of H2O2 = 6.8 x 10^-3 x 5 / 2 = 0.0170 mol

volume of H2O2 = 50 mL

Molarity = 0.0170 / 0.050 = 0.340 mol / L

concentration of H2O2 = 0.340 mol / L

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