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 reaction:

2KMnO4(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 20.8 mL of the KMnO4 solution?

Explanation / Answer

2KMnO4(aq)+H2O2(aq)+3H2SO4(aq) -------------------> 3O2(g)+2MnSO4(aq)+K2SO4(aq)+4H2O(l)

moles of KMnO4 = 20.8 x 1.68 / 1000 = 0.03494 mol

from the balanced equation :

2 mol KMnO4 ----------------. 1 mol H2O2

0.03494 mol KMnO4 --------------> ??

moles of H2O2 = 0.01747 mol

moles = mass / molar mass

0.01747 = mass / 34

mass of H2O2 = 0.594 g

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