Lab8_results - Experiment 8: Redox Titration Determination...

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Experiment 8: Redox Titration – Determination of Oxalate Michael Butler Georgia Tech Honor Challenge I commit to uphold the ideals of honor and integrity by refusing to betray the trust bestowed upon me as a member of the Georgia Tech community. Date Submitted: 6/23/10 Lab Partner: Shivani Shah Lab Section/TA: 1312 A2/Lisa Vaughan
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STUDENT NOTES: Chem 1312: Exp 8 –Redox Titration of Oxalate Compound Spring 2010 I. Cover/Title: 5pts II. Data/Results: 50 pts A. Standardization of KMnO4 ~0.01M ( 11pts) Mass of Na 2 C 2 O 4 ~0.10x g Moles of Na 2 C 2 O 4 Moles of KMnO 4 Vol. of KMnO 4 to reach pink endpt. (L) Molarity of KMnO 4 Trial 1 0.109 8.134E-04 3.254E-04 3.210E-02 1.010E- 02 Trial 2 0.102 7.612E-04 3.045E-04 3.130E-02 9.730E- 03 Average M 9.915E- 03 B. Percent oxalate by titration in previously synthesized compound (11 pts) C. Sample Calculations: (28 pts-7 pt each) 1. Standardization of KMnO 4 Vol. of KMnO 4 to reach pink endpt. (L) Moles of KMnO 4 Moles of oxalate found g of oxalate found g of metal oxalate weighed Wt. % oxalate by titration Wt. % oxalate by calculation Trial 1 2.820E- 02 2.796E-04 6.990E-04 6.151E- 02 1.210E-01 50.83 49.75 Trial 2 2.470E- 02 2.449E-04 6.123E-04 5.388E- 02 1.060E-01 50.83 49.75 Average % 50.83 4 4 4 4 4 4 2 2 4 4 2 2 4 2 2 4 2 2 4 4 02 010 . 1 02 210 . 3 04 254 . 3 : 04 254 . 3 O C Na 5 2 O C Na 134 O C Na 1 O C Na 109 . 0 : : tan KMnO M E KMnO L E KMnO mol E KMnO Molarity KMnO mol E mol KMnO mol g mol g KMnO Mol KMnO of n dardizatio S - = - - - = × ×
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2. Weight Percent Oxalate of Your Metal Oxalate: calculated using titration data Weight Percent Oxalate of Your Metal Oxalate: calculated from molecular formula (theoretical %) 4. Percent error calculation: weight percent of oxalate; x100 formula molecular from % weight data titration from % weight = III. Discussion: 30 pts The experiment was designed to provide experience with standardizing a titrant against a primary
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Lab8_results - Experiment 8: Redox Titration Determination...

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