Experiment on Razor Blade Discussions

Topics: Titration, The Masses, The Tip Pages: 1 (261 words) Published: July 11, 2012

The first portion of this experiment was the standardization of 0.1 N KMnO4 solution. In determining the Normality of KMnO4 (FW=158grams/mol), Na2Cr2O4 was used as the primary standard. Na2Cr2O4 was titrated with KMnO4 in three trials. The Normality of KMnO4 computed using the volume of KMnO4 obtained during the three trials on the titration with Na2Cr2O4. The mass of Na2Cr2O4 used (see appendix). The Normality obtained in each trial are slightly close with each other. This may be due to the differences of the masses in Na2Cr2O4 and the volume of KMnO4. Other sources of this might arisen from technical problems like the formation of bubbles in the tip of the burette. The second portion of the expirement was the analysis of razor blade. The dissolved razor blade solution was titrated with KMnO4. The volume of KMnO4 was recorded. There are slightly differences in the volume of KMnO4 used in each trial. The volume of KMnO4 used and the mass of KMnO4 was used in determining the percentage of iron in the razor blade(see appendix). In trial 1, the percentage of iron computed was 81.38%; in trial 2, the percentage was 85.95%; and in trial 3, 80.52%. As observed, the result in trial 2 was differed with trial 1 and 2. This may be due to some errors. Maybe our titration process was not properly done, and the apparatus that are used was not properly washed but me successfully did the experiment and computed the percentage of iron in the razor blade.
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