Lithium Methoxide Solution Preparation
- Dissolve in small portions 0.7 g of freshly cut lithium in 150 ml of anhydrous methanol, cooling the flask during the addition of the metal.
- When the reaction is complete add sufficient toluene to produce 1000 ml.
- If cloudiness or precipitation occurs, add sufficient anhydrous methanol to clarify the solution.
- Standardise the solution immediately before use in the following manner.
Lithium Methoxide Solution Standardization
- Weigh accurately about 0.25 g of benzoic acid, dissolved in 25 ml of dimethylformamide.
- Titrate with lithium methoxide solution, using quinaldine red solution as the indicator and protecting the solution from atmospheric carbon dioxide throughout the titration.
- Perform a blank determination and make any necessary correction.
- 1 ml of 0.1 M lithium methoxide is equivalent to 0.01221 g of C7H6O2.
- Calculate the molarity of solution by the following formula:
M = ------------------------------------------
Lithium Methoxide in ml x 12.21
Also see: Determination of Shelf Life of Solutions in Laboratory
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