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Redox Titration: Permanganate against Oxalate (Ethanedioate)
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| Submitted: Tue Aug 19 2003
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Redox Titration: Permanganate against Oxalate (Ethanedioate) Aims: Find out the concentration of oxalic acid and oxalate by titration with sodium hydroxide. Chemical: Mixture of oxalic acid and oxalate, standard NaOH(about 0.05M), standard KMnO4(about 0.02M), 2M H2SO4, phenolphthalein indicator Apparatus: Titration apparatus, Bunsen burner Procedure: (A) Dilution The mixture of oxalic acid and oxalate should be diluted ten times. Using pipette filler pipette 25cm3 of given solution and dilute it to 250cm3 in a volumetric flask. The resulting solution can be used for subsequent titration. (B) Acid-base titration Titrate a 25cm3 portion of the diluted mixture against the given standard Sodium Hydroxide (0.05M). Add 3 drops of Phenolphthalein indicator. At the end point, the solution will change from colorless to pink. Repeat the titration for 3 more times to find out the average volume. (C) Redox titration Titrate another 25cm3 portion of the diluted mixture against the given standard potassium permanganate KMnO4 (0.02M)....
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