Preparation And Standardisation of 0.1 M Ammonium Cerium (IV) Nitrate BP volumetric solution
1. PREPARATION:
Shake for 2 minutes a solution containing 56 mL of Sulfuric acid & 54.82 g of Ammonium and cerium nitrate, add five successive quantities, each of 100 mL of water, shaking after each addition. Dilute the clear solution to 1000 mL with water. Standardise the solution after 10 days.
2. STANDARDISATION:
Dissolve 0.300 g of ferrous ethylenediammoium sulfate RV in 50 mL of sulfuric acid (49g/ L sulfuric acid). Titrate the ammonium and cerium nitrate solution determine the end point potentiometrically or using 0.1 mL of Ferroin as indicator.
1 mL of 0.1 M ammonium and cerium nitrate is equvelent to 38.21 mg of Fe(C2H10N2) (So4)2, 4H2O.
Calculation :
Molarity = [0.1 x weight of Ferrous ethylenediammoium sulfate (in g) ]/ [0.03821 x Titration Reading (in mL)]
Limit: 0.1 M ± 5 % (0.0950 M – 0.1050 M)
3. PREPARATION OF INDICATORS / REAGENTS:
Ferroin :
Dissolve 0.7 g of Ferrous sulphate & 1.76 g of Phenanthroline hydrochloride in 70 mL of water & add sufficient water to produce 100 mL.
4. STORAGE CONDITION:
Store in amber glass stoppered bottles. (Protect from light)