SOP FOR PREPARATION AND STANDARDIZATION OF 0.1M ZINC SULPHATE

PREPARATION:
For a 0.1M solution Dissolve 29 g of zinc sulphate in sufficient water to produce 1000 ml.
Standardisation
To 20 ml add 5 ml of 2M acetic acid in a 500 ml conical flask dilute the prescribed solution to 200 ml with water and add about 50 mg of xylenol orange triturate and sufficient hexamine to produce a violet-pink colour. Add a further 2 g of hexamine and titrate with 0.1M disodium edetate VS until the colour changes to yellow. Each ml of 0.1M disodium edetate VS is equivalent to 6.54 mg of Zn.
Calculation
---------------
Note:
1) Discard the solution after 30 days.
2) Restandardise before use
3) For storage and labeling follow the general procedure.