List of organic compounds for analysis: · Part 4

to MnO - ions and MnO - ion (from Mn + ) is reduced to Mn + ion. Oxidation : + Fe Fe 5e → Reduction : + colourles Pink s 8H + 5e Mn 4H M nO − + → Overall reaction : + + 5Fe MnO 8H 5Fe Mn 4H O → Short procedure: S.no Content Titration-I Titration-II Burette solution KMnO KMnO Pipette solution ml of standard FAS ml of unknown FeSO Acid to be added 20ml of 2N H SO (approx) 20ml of 2N H SO (approx) Temperature Lab temperature Lab temperature Indicator Self-indicator (KMnO ) Self-indicator (KMnO ) End point Appearance of permanent pale pink colour Appearance of permanent pale pink colour Equivalent weight of FeSO = Procedure : Titration–I (Link KMnO )Vs (Standard FAS) Burette is washed with water, rinsed with KMnO solution and filled with same KMnO solution up to the zero mark. Exactly ml of standard FAS solution is pipetted out into the clean, washed conical flask. To this FAS solution, approximately 20ml of 2N sulphuric acid is added. This mixture is titrated against KMnO Link solution from the burette. KMnO is added drop wise till the appearance of permanent pale pink colour. Burette reading is noted, and the same procedure is repeated to get concordant values.