Redox titrations are used to determine the amounts of oxidizing and reducing age

Question

Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents the reaction2KMnO4(aq)+H2O2(aq)+3H2SO4(aq)3O2(g)+2MnSO4(aq)+K2SO4(aq)+4H2O(l)A certain amount of hydrogen peroxide was dissolved in 100. mL of water and then titrated with 1.68 M KMnO4. What mass of H2O2 was dissolved if the titration required 14.3 mL of the KMnO4 solution?

Explanation / Answer

mmol of KMnO4 = MV = 14.3*1.68 = 24.024mmol of KMnO4

since rati ois 1:2; or 1/2 then

mmol of H2O2 = 24.024*1/2 =12.012 mmol of H2O2

[H2O2] = mmol/ V = 12.012/(100) = 0.12012 M of H2O2

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