How to Prepare 0.02 N Mercuric Nitrate Solution?

Preparation of 0.02 Mercuric Nitrate Solution

Dissolve 6.85 gm of mercuric nitrate in 20 ml of 1M nitric acid and add sufficient water to produce 1000 ml. Standardize the solution in the following manner.

Standardization of 0.02 Mercuric Nitrate Solution

Dissolve 15 mg of sodium chloride in 50 ml water and titrate with the 0.02M mercuric nitrate solution. 

Then, determine the end-point potentiometrically using a platinum or mercury mercurous sulphate reference electrode.  

Each 1 ml of 0.02M mercuric nitrate equals 0.002338gm of NaCl.

Calculation

            Wt. of sodium chloride (mg) x Potency of sodium chloride× 0.02
Molarity  =  ---------------------------------
               Volume Consumed (ml) x 2.338 × 100

                      

ACCEPTANCE CRITERIA

1) Accuracy of the solution should be within ± 10% of the theoretical concentration.

2) RSD* of the triplicate results of standardization/ re-standardization should not be more than 0.2%.