Preparation and standardization of 0.05 M Potassium Iodate EP Volumetric Solution
Dissolve 10.70 g of Potassium Iodate in water and dilute to 1000.0 ml with the same solvent.
Dilute 25.0 ml of the Potassium Iodate solution to 100.0 ml with water. To 20.0 ml of this solution add 2 g of Potassium Iodide and 10 ml of dilute Sulphuric acid. Titrate with 0.1 M Sodium Thiosulphate, using 1 ml of Starch solution, added towards the end of the titration as indicator.
Molarity (M) = [Titration reading (in ml) x Molarity of 0.1 M Sodium x 100 Thiosulphate]/ [20 x 6 x 25]
Limit: 0.05 M ± 5 % (0.0475 M – 0.0525 M)
3. PREPARATION OF INDICATORS / REAGENTS:
a. Dilute Sulphuric acid:
Add 5.5 ml of Sulphuric acid to 60 ml of water, allow to cool and dilute to 100 ml with the same solvent.
b. 0.1 M Sodium Thiosulphate VS:
Preparation and standardisation as per respective procedure.
4. STORAGE CONDITION:
Store in glass stoppered bottles.