Chrominfo: Preparation and standardization of 0.1 M sodium methoxide solution

Learn about the preparation and standardization of 0.1 M sodium methoxide solution through a laboratory experiment or practical.

Aim:

To prepare and standardize 0.1M sodium methoxide solution using benzoic acid as a primary standard. (Non-aqueous titration)

Requirements:

Glasswares: Burette, burette stand, conical flask, volumetric pipette, beaker, volumetric flask, funnel, glass rod, and wash bottle, etc.

Chemicals: Sodium methoxide (CH3NaO), benzoic acid (C7H6O2), thymolphthalein indicator, dimethylformamide (C3H7NO), and methanol (CH3OH), etc.

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 0.4 gm of benzoic acid, properly weighed, and dissolved in 80.00 ml of dimethylformamide.
Add 0.15 ml of thymolphthalein indicator solution.
Perform the titration with sodium methoxide solution until the end-point.
The blue color indicates the blue endpoint of the titration.
Make any necessary corrections after performing a blank determination.
During the titration, protect the solution from atmospheric carbon dioxide
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: