Qualitative Analysis Lab

In the lab, the purpose was to standardize a KMnO4 solution than using it to evaluate how close a H2O2’s concentration was to its labeled concentration. In this lab, it was decided to compare the concentration of new Publix brand hydrogen peroxide to an old sample of the same solution. From the data collected in the first part by titrating a solution of FeSO4*7H2O with the KMnO4 solution, it was determined that the concentration was .028M MnO4-. This was able to be done because a known amount of FeSO4*7H2O was in the solution, from this, when it is completely titrated by the KMnO4 it is possible to find the molarity of the MnO4- used by measuring the amount of it used to titrate the FeSO4. After finding the molarity of the solution it was used to find the percent by mass of H2O2 in the solution.
This means that the solution had lost .05% over the shelf life. Additionally, the advertised 3% may be untrue due to the new solution having 2.91%. The process of transferring electrons in a titration is known as a redox titration. While in this experiment a redox titration was used on a man-made chemical, redox titrations can also be found naturally occurring in nature. For instance, plants convert Carbon Dioxide and water into carbohydrates and oxygen gas, in this reaction: (insert reaction from other tab here) the oxygen is being oxidized and the carbon in CO2 is being reduced. The energy required for this reaction is provided by sunlight. In this lab, one source of error that may have occurred was over titrating the old Publix solution. From this error, it would seem as if more KMnO4 was used than what was actually