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) |
|
Initial |
Final |
|||
1 |
|
|
|
|
2 |
|
|
|
|
3 |
|
|
|
|
|
Mean: |
Calculations:
1 ml of 0.1 M sodium methoxide is equivalent to 0.01221 g of C7H6O2.M= weight of C7H6O2 / 0.01221 x volume of titer (ml) x 12.21
Result:
The strength of the prepared sodium methoxide solution was found to be_____M.You may also like this
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