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 MKMnO4. What mass of H2O2 was dissolved if the titration required 12.3 mL of the KMnO4 solution?

Express your answer with the appropriate units.

Explanation / Answer

Answer:
12.3 ml of 1.68 M KMnO4
no of moles of KMnO4 = 12.3/1000*1.68 = 0.020664 moles
2 moles of KMnO4 requires 1 mol of H2O2 for titration
1 mole of KMnO4 requires 1/2 moles of H2O2 for titration
0.020664 moles of KMnO4 will require 1/2*0.020664 = 0.010332 moles of H2O2.
Molar mass of H2O2 = 2*1+2*16 = 34 g/mol
Mass of 0.010332 moles of H2O2 = 34*0.010332= 0.351288 g

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