Preparation and Standardisation of 0.01 M Lead Nitrate BP Volumetric Solution
1. PREPARATION:
Dissolve 3.3 g of Lead (II) nitrate in sufficient water to produce 1000 ml.
2. STANDARDISATION:
To 50 ml of 0.01M Lead nitrate solution add 300 ml of water and introduce into 500 ml conical flask. Add about 50 mg of Xylenol orange triturate & hexamethylenetetramine until solution becomes violet pink colour. Titrate with 0.01M Disoidum edetate until the violet-pink colour changes to yellow.
Each ml of 0.01 M Disodium edetate VS is equivalent to 3.312 mg of Pb(NO3)2.
Calculation:
Molarity (M) = (Molarity of 0.01 M Disodium edetate x Titration reading)/ Volume of 0.01 M Lead nitrate taken
Limit: 0.01 M ± 5 % (0.0095 M – 0.0105 M)
3. PREPARATION OF INDICATORS / REAGENTS:
a. Xylenol orange triturate:
Triturate 1 part of Xylenol orange with 99 parts of Potassium nitrate.
b. 0.01M Disoidum edetate:
4. STORAGE CONDITION:
Store in glass-stoppered bottles.
