Question

I need a hypothesis for Analysis of Hydrogen Peroxide Solutions. Can anyone help?

Answer 1

In this experiment you will determine the actual mass percentage of hydrogen peroxide by performing a titration with potassium permanganate in a redox reaction. We will test samples from both new and old bottles.

You will determine the percentage of hydrogen peroxide (H2O2) in the solution by reacting it with a known quantity of potassium permanganate (Mn7+) solution. In this reaction, H2O2 is oxidized to O2, and Mn7+ is reduced to Mn2+. The reaction is:

2MnO4-(aq) + 6H+(aq) + 5H2O2(aq) --> 5O2(g) + 2Mn2+ (aq) + 8H2O(l)

The mass percent of hydrogen peroxide is determined from the masses of the solutions used in the experiment and the stoichiometry of the reaction.

This analysis is carried out by titration since the MnO4- ion is purple and the Mn+2 ion is colorless. As long as H2O2 is present to react with the permanganate ion, the solution remains colorless. The endpoint is then reached when there is excess permanganate ion as indicated by the purple color.moles MnO4- = molarity x volume ( in Liters)

moles H2O2 = 5 x moles MnO4-/2
mass H2O2 = moles H2O2 x 34.014 g/mol
% H2O2 = mass H2O2 x 100/ mass solution