Titration Question Redox titrations are used to determine the amounts of oxidizi

Question

Titration 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 17.8 mL of the KMnO4solution?

Explanation / Answer

H2O2 =

V = 100 ml

titrated with

KMnO4 = 1.68 M

V = 17.8 ml

first, calcualte KMnO4 used

mol = MV = 1.68*17.8 = 29.904

then we ahve 29.904 mmol of KMNO4

2KMnO4(aq)+H2O2(aq)

since ratio is 2:1, we need half of that to neutralize H2O2

29.904/2 = 14.952 mmol of H2O2

mass = mol*MW = 34*(14.952*10^-3) = 0.508368 g of H2O2

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