Chrominfo: Preparation and standardization of 0.1 M sodium nitrite

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)
Sr. No.	Content in conical flask	Initial	Final	Volume of titrant used (ml)
1
2
3
				Mean: