Class 12 Chemistry Practicals Volumetric Analysis Estimation of Ferrous Sulphate

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VOLUMETRIC ANALYSIS
 
Ex.No: 1. : - 1.ESTIMATION OF FERROUS SULPHATE (FeSO4)
 
 
AIM:
 
To Estimate the amount of ferrous sulphate dissolved in 750 ml of the given unknown solution volumetrically. For this you are given with a standard solution of ferrous ammonium sulphate (FAS) of normality 0.1102N and potassium permanganate solution as link solution.
 
PRINCIPLE:
 
During these titrations, Fe2+ ions (from ferrous salts) are oxidised to Fe3+ ion and MnO4 - ion (from Mn2+) ion reduced to Mn2+ ion.
Class 12 Chemistry Practicals Volumetric Analysis Estimation Of Ferrous Ammonium 1
 
PROCEDURE:
 
TITRATION – I: (Std FAS) Vs (Link KMnO4):
 
Burette is washed with water, rinsed with KMnO4 solution and filled with the same KMnO4 solution up to zero mark. Exactly 20ml of standard FAS solution is pipetted out into a clean, washed conical flask. To this FAS solution, approximately 20ml of 2N H2SO4 is added. This mixture is titrated against KMnO4 link solution from the burette. KMnO4 is added drop wise till the Appearance of permanent pale pink colour. The burette reading is noted, and the same procedure is repeated to get concordant values.
 
TITRATION – II: (Link KMnO4) Vs (Unknown FeSO4):
 
Burette is washed with water, rinsed with KMnO4 solution and filled with the same KMnO4 solution up to zero mark. Exactly 20ml of unknown FeSO4 solution is pipetted out into a clean, washed conical flask. To this FeSO4 solution, approximately 20ml of 2N H2SO4 is added. This mixture is titrated against KMnO4 link solution from the burette. KMnO4 is added drop wise till the Appearance of pale permanent pink colour. Burette reading is noted and the same procedure is repeated to get concordant values.
 
 

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