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)O2(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 H2O2was dissolved if the titration required 17.3 mLof the KMnO4 solution?

Explanation / Answer

number of moles of KMNO4 required = M*V

                                                      = 1.68 M*(0.0173 L)

                                                     =0.029064 mol

From the given reaction, 2 mol of KMNO4 reacts with 1 mol of H2O2

So,number of moles of H2O2 required = 0.029064 / 2 = 0.014532 mol

use:

number of moles of H2O2 = mass of H2O2/Molar mass of H2O2

0.014532 =mass/ 34.0147

mass = 0.49 g

Answer: 0.49 g

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