SOP FOR PREPARATION AND STANDARDIZATION OF 0.02M MERCURIC NITRATE

PREPARATION:
Dissolve 6.85 g of mercury nitrate in 20 ml of 1M nitric acid and add sufficient water to produce 1000 ml.
Standardisation
Dissolve 15 mg of sodium chloride in 50 ml of water and titrate with the mercury nitrate solution determining the end point potentiometrically, using a platinum or mercury indicator electrode and a mercury-mercury(I) sulphate reference electrode. Each ml of 0.02M mercury(II) nitrate VS is equivalent to 2.338 mg of NaCl.
Calculation
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Note:
1) Discard the solution after 30 days.
2) Restandardise before use
3) For storage and labeling follow the general procedure.