Preparation and standardization of 0.1 M Lead Nitrate BP Volumetric Solution
Dissolve 33.00 g of Lead nitrate in water and dilute to 1000 mL with the same solvent.
Ascertain its exact concentration as follows :
Take 20 mL of Lead nitrate solution into a 500 mL conical flask and dilute to 200 mL with water. Add about 50 mg of Xylenol orange triturate and Hexamethylenetetramine until the solution becomes violet pink. Titrate with 0.1 M Sodium edetate until the violet-pink colour changes to yellow.
1 mL of 0.1 M Sodium edetate is equivalent to 20.72 mg of Lead
Molarity =[T.R. x Molarity of 0.1M Sodium edetate]/20
Limit: 0.1 M ± 5 % (0.0950 M – 0. 1050 M)
PREPARATION OF INDICATORS / REAGENTS:
0.1 M Disodium Edetate