Determination of oxalate using volumetric analysis calculate...

Determination of % Oxalate Using Volumetric Analysis Calculate percentage purity Flask 1: Oxalate = 0.0600g Flask 2: Oxalate = 0.0596g Flask 3: Oxalate = 0.0604g Titration of Oxalate Complex against KMnO4 Initial (mL) Final (mL) Volume used (mL) 2.00 14.10 12.10 2.00 14.00 12.00 2.00 13.75 11.75 Molarity of KMnO4 = 0.01002M

Average weight of oxalate in percentage- m(K3(Fe(C2O4)3).3H2O)/(Number of attempts/titrations)=(0.118g + 0.102g + 0.0987g)/3 = 0.106g Mass of C2O42-/(Number of attempts/titrations) = (0.01796g + 0.01828g + 0.01768g)/3 = 0.01797g Average weight of oxalate in percentage = (0.01797g/0.106g) x 100 = 16.95% Theoretical percentage of oxalate in potassium ferric oxalate Theoretical percentage of oxalate: potassium ferric oxalate trihydrate = oxalate 491.25 g/mol = 88.018 100 g/mol = 'x' x = 88.018 x 100/491.25 Theoretical % of oxalate = 17.92% % Error = (practical % of oxalate - theoretical % of oxalate) x 100 The concentration of KMnO4- 0.02M Using the chemical formula, calculate the theoretical percentage of oxalate in potassium ferric oxalate. Calculate the percentage error in your analysis. Comment on the results. Specifically, is your analysis in error? Or, is any error you observe associated with the quality of the sample?

Shaiju T.

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