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A lab report detailing an experiment conducted to standardize a 0.02m potassium permanganate (kmno4) solution using sodium oxalate (na2c2o4) as a reference. The report includes the procedure, reagents used, work management, results, and conclusions.
Typology: Lab Reports
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Lab #6 (36E-1,2), TITRATION WITH POTASSIUM PERMANGANATE, PREPARATION OF 0.02M OF POTAS- SIUM PERMANGANATE, AND STANDARDIZATION OF POTASSIUM PERMANGANATE SOLUTION RADU PURTUC QUANTITATIVE ANALYSIS LAB, CHEM 213 Group # 5 Radu Purtuc Lavonne Salis Tunde Tamas Rafal Krejza Experiment Start Date: July 12, 2006 Experiment End Date: July 14, 2006 Report Due Date: July 17, 2006
The purpose of this experiment was to accomplish standardization titration of Potassium Permanganate against Sodium Oxalate solution of known concentration. This is an oxidation reduction reaction, thus there was no need for special indicators. PROCEDURE Clean and dry four Erlenmeyer flasks, four Burettes, two 200 mL beakers, and two 500 mL beakers, a spatula, and a glass rod. Record Lot Number of compounds used in this experiment: 0.02M KMnO4 Lot# 36M H2SO4 Lot# 2876 Na2C2O4 Lot#
Part A Preparation of Solutions
1000mL
visible particles settle at the bottom of flask
endpoint reached within 1 drop = 0.05 mL. Final volumes corrected against blank as noted Part B Standardization of 0.02M KMnO4 against Na2C2SO4 solution of known concentration
pink)
0.02M KMnO 35 M H2SO4 Lot# 2876 Na2C2O Distilled H2O WORK MANAGEMENT Radu was the group leader for this experiment. Tunde, Lavonne, and Rafal alternated between tasks so that one does a measurement while the other visually checked the results to ensure work efficiency while keeping determinant error to its lowest possible value. Rafal weighed Na2C2O4 while Radu watched for
Table 1 : Titrant volumes and molar concentration of KMnO Analyst Mass KMnO (g) Mass Na2C2O (g) Volume (mL) KMnO Blank Adjustment ( - 0.05 mL ) Molarity KMnO (M) Radu 0.7902 0.1340 19.60 19.55 0. Rafal 0.7902 0.1340 19.20 19.15 0. Lavonne 0.7902 0.1340 19.90 19.85 0. Tunde 0.7902 0.1340 19.60 19.55 0. Mean 19.53 0. Standard Dev 0.29 0. RSD % 1.48 1.
The experiment calculated what was the actual molarity of the stock 0.02M KMnO4. Following a number
Possible errors are as follows: Instrument errors: Calibration of scales and volumetric ware (graduated cylinders). Method errors: Not delivering the entire amount of crystals measured into flasks. Personal errors: Reading of the meniscus in graduated cylinders.