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Oxidation-Reduction (Redox) Titration of Oxalate in K 3 Fe(C 2 O 4 ) 3 ·3H 2 O

Oxidation-Reduction (Redox) Titration of Oxalate in K 3 Fe(C 2 O 4 ) 3 ·3H 2 O. First things first…. Safety: Put bags away Goggles Lab Jacket Gloves Acidic Reactants! Quiz! LAB!. What is titration anyway?. Using a buret, you can deliver a specific volume of a solution for a reaction

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Oxidation-Reduction (Redox) Titration of Oxalate in K 3 Fe(C 2 O 4 ) 3 ·3H 2 O

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  1. Oxidation-Reduction (Redox) Titration of Oxalate in K3Fe(C2O4)3·3H2O

  2. First things first… • Safety: • Put bags away • Goggles • Lab Jacket • Gloves • Acidic Reactants! • Quiz! • LAB!

  3. What is titration anyway? • Using a buret, you can deliver a specific volume of a solution for a reaction • To read a volume in a buret, look at the bottom of the meniscus • Be sure to note the start volume and the final volume. • No bubble in tip!

  4. Procedure WEAR GLOVES! Permanganate will stain • Weigh 0.1g of the potassium trioxalatoferrate into 3 separate 125 or 250 mLErlenmeyers • Make sure to record mass to 0.00Xg (3 significant figures) • Add ~20 mL of 1.0 M Sulfuric acid • Rinse buret with two 5 mL portions KMnO4, and then fill halfway with (X.XX M) KMnO4 • Titration! Repeat for a total of 3 titrations

  5. Actual Titration • Place the Erlenmeyer on a hot plate and stir until it dissolves and temp 80-90ºC • Titrate KMnO4 from the buret, temp >60ºC • Keep stirring • As the endpoint approaches, titrate SLOWLY, drop-wise until the sol’n becomes pink (reaches end-point) • Waste: KMnO4 in buret goes to beaker back hood • Titrated solution goes down the sink

  6. Calculations Moles KMnO4 reduced Moles C2O4 oxidized MW C2O4 Mass C2O4 Weight % Sample mass originally weighed (~0.1xxg)

  7. Everything due before leaving lab • Turn in today: pre-lab with calculations (yellow sheet) • Finish calculations, including % error • Include pages from lab manual if yellow pages are not easy to read • Enter data into computer/spreadsheet • Do initial log in • Password: last 3 digits g number • Then one individual member adds data • Group members: group id is the individual id who entered data

  8. Due Next Class • Freezing point depression quiz and pre-lab • Lab Report: • Data analysis (based upon lab handout “Redox Titration of Oxalate” on chem.gmu.edu/results site) • 1-2 page double spaced discussion/conclusion page • Do not use discussion ?s

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