Learn about the preparation and standardization of 0.1 M sodium nitrite solution through a laboratory experiment or practical.
Aim:
To prepare and standardize 0.1 M sodium nitrite solution using sulfanilamide.
Requirements:
Glasswares: Burette, burette stand, conical flask, volumetric pipette, beaker, volumetric flask, funnel, glass rod, and wash bottle, etc.
Chemicals: Sulfanilamide (C6H8N2O2S), hydrochloric acid (HCl), potassium bromide (KBr), and sodium nitrite (NaNO2), etc.
Preparation of 0.1 M sodium nitrite solution:
Take properly weighed 07.50 gm of sodium nitrite and dissolve in 800 ml of distilled water, once it has completely dissolved, make up the volume to 1000 ml.
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.
- In a 50.00 ml 2M hydrochloric acid solution, dissolve 0.3 gm of sulphanilamide.
- Add 03.00 g KBr, cool on ice, and titrate with prepared 0.1 M sodium nitrite solution until the endpoint, which is determined potentiometrically.
- 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 sodium methoxide solution.
Observation table:
Sr.
No. |
Content
in conical flask |
Burette
reading |
Volume
of titrant used (ml) |
|
Initial |
Final |
|||
1 |
|
|
|
|
2 |
|
|
|
|
3 |
|
|
|
|
|
Mean: |
Calculations:
1 ml of 0.1 M sodium nitrite is equivalent to 0.01722 g of sulphanilamide.
M = Sulphanilamide in mg / NaNO2 in ml x 17.22
Result:
The strength of the prepared sodium nitrite solution was found to be_____M.
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