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It deserves the instructor’s special handling and storage attention. Hazard Code: C—Somewhat hazardous. The hazard information reference is: Flinn Scientific, Inc., Chemical and Biological Catalog Reference Manual, P.O. Box 219, Batavia, IL 60510, (800) 452-1261, SAMPLE DATA TABLETrial 1Trial 2Trial 3Volume of 0.3% H2O2solution (mL)10.0010.2010.10Volume of 0.02 M MnO4–solution used (mL)20.1020.4020.20Calculated number of moles of H2O21 × 10−3from Pre-Lab Q51 × 10−3from Pre-Lab Q51 × 10−3from Pre-Lab Q5Answers to PRE-LAB QUESTIONS1.Write the oxidation and reduction half-reactions for the redox reaction taking place in this laboratory. 2O e−2.Identify the oxidizing agent for this reaction. Justify your answer.3.How many moles of electrons are transferred in the balanced redox reaction? Justify your answer.8 H2O 10 e−O (l)Adapted from Advanced Chemistry with Vernier & Laboratory Experiments for Advanced Placement Chemistry by Sally Ann Vonderbrink, Ph. D.
Determination of Concentration by Oxidation-Reduction Titration4.Calculate the number of moles of MnO4−in 20.1 mL of 0.020 M potassium permanganate solution.4−5.Calculate the number of moles of hydrogen peroxide needed to react with 20.5 mL of 0.020 Mpotassium permanganate solution. )2−42.6.The introduction states that the hydrogen peroxide solution sold in grocery stores is 3% (by mass). Assuming a density of 1.0 g/mL, calculate the molarity and mole fraction of 3.0 % H2O2.2Answers to POST-LAB QUESTIONS AND DATA ANALYSIS1.Calculate the moles of MnO4–used to reach the equivalence point of the reaction for eachtrial.Adapted from Advanced Chemistry with Vernier & Laboratory Experiments for Advanced Placement Chemistry by Sally Ann Vonderbrink, Ph. D.
Determination of Concentration by Oxidation-Reduction Titration