Dissolve 3.312 g of Lead nitrate in sufficient water to produce 1000 ml.
Pipette 50 ml of the solution into a flask,add 50 mg of xylenol orange mixture and sufficient hexamine to produce a violet pink colour and titrate with 0.1 M disodium edetate to a lemon yellow end point.
Each ml of 0.1M disodium edetate is equivalent to 0.03312 g of Lead nitrate
Molarity factor:0.03312 x 50 x V/1000 x W
V= Volume of 0.1M disodium edetate consumed in ml
W= Weight of lead nitrate in g
1) Restandardise before use
2) Discard the solution after 30 days.
3) For storage and labeling follow the general procedure.