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Determination of Oxalate by Titration

Outline. PurposeRedox ReactionProcedureCalculation SequenceGlassware SetupSafety ConcernsWasteWhat to turn inExperiment 8 Reminder. Purpose. Analyze three unknown samples for oxalate via titration.Compare the analytical results of your redox reactions with the percent oxalate in three known

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Determination of Oxalate by Titration

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    1. Determination of Oxalate by Titration Experiment 7

    2. Outline Purpose Redox Reaction Procedure Calculation Sequence Glassware Setup Safety Concerns Waste What to turn in Experiment 8 Reminder

    3. Purpose Analyze three unknown samples for oxalate via titration. Compare the analytical results of your redox reactions with the percent oxalate in three known compounds. Identify the unknowns. Gain experience in completing a titration without the use of a formal indicator.

    4. Redox Reactions Half reaction for the oxidation of C2O42-: C2O42-(aq) ? 2CO2(g) + 2e- Half reaction for the reduction of Mn7+: 8H+(aq) + MnO4-(aq) + 5e- ? Mn2+(aq) + 4H2O(l) Complete reaction: 16H+(aq) + 5C2O42-(aq) + 2MnO4-(aq) ? 10CO2(g) + 8H2O(l) + 2Mn2+(aq)

    5. Procedure Start off with a known mass of unknown oxalate compound. Determine the moles of oxalate in the unknown by performing a titration with permanganate. At the point where all the oxalate has reacted with the permanganate we are adding by way of the buret, we see a color change from yellow to light pink. This end point is indicative of passing the equivalence point slightly. An end point error is introduced and needs to be minimized as much as possible. From the known concentration and measured volume of permanganate added, we calculate the moles of oxalate, keeping in mind our stoichiometric ratio given by the complete reaction (2:5).

    6. Calculation Sequence Sample calculations are on pp. 182 and 183 Percent oxalate in your known compounds Moles of permanganate Moles of oxalate Mass of oxalate Percent oxalate present by mass Percent error (experimental values compared to known values)

    7. Glassware Setup

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