Learn about the preparation and standardization of 0.02 M mercuric nitrate solution through a laboratory experiment or practical.
Aim:
To prepare and standardize 0.02 M mercuric nitrate solution using standard sodium chloride (volumetric solution).
Requirements:
Glasswares: Burette, burette stand, conical flask, volumetric pipette, beaker, volumetric flask, funnel, glass rod, and wash bottle, etc.
Chemicals: Mercuric nitrate (Hg(NO3)2), sodium chloride (NaCl), and nitric acid (HNO3), etc.
Preparation of 0.02 M mercuric nitrate solution:
Take properly weighed 06.80 gm of mercuric nitrate and add in 20 ml of 1M nitric acid, Once it has completely dissolved, make up the volume to 1000 ml with water.
Titration procedure:
- All glassware should be cleaned and dried according to standard laboratory procedures.
- Before filling the burette for the titration, rinse it with distilled water and then pre-rinse it with a portion of the titrant solution. Pre-rinsing is required to make sure that all solution in the burette is the desired solution, not a contaminated or diluted solution.
- Take the unknown stock solution of titrant in a clean and dry beaker then fill the burette using the funnel.
- Remove air bubbles from the burette and adjust the reading to zero.
- Take 15.00 mg of sodium chloride and add 50 ml of water.
- Titrate it with mercuric nitrate solution until the endpoint, which is to be determined potentiometrically.
- Titration can be done with a platinum or mercury indicator electrode and a mercury-mercurous sulfate reference electrode
- To get accurate results, repeat the titration three times.
- Properly record the readings of the burette.
- Take their mean and calculate the molarity of the mercuric nitrate solution.
- 1 ml of 0.02 M mercuric nitrate is equivalent to 0.002338 g of sodium chloride.
Observation table:
|
Sr.
No. |
Content
in conical flask |
Burette
reading |
Volume
of titrant used (ml) |
|
|
Initial |
Final |
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|
1 |
|
|
|
|
|
2 |
|
|
|
|
|
3 |
|
|
|
|
|
|
Mean: |
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Result:
The strength of the prepared mercuric nitrate solution was found to be_____M.
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