What is 0.1 M tetrabutylammonium hydroxide solution?

Tetrabutyl Ammonium Hydroxide (0.1M) 

Molecular formula: (C₄H₉)₄ N⁺OH⁻ 

Molecular weight: 259.48 

Preparation: Dissolve 40 g of tetra butyl ammonium iodide in 90 mL of dehydrated methanol in a glass stoppered flask. Place the flask in an ice bath. Add 2 g of powdered silver oxide, insert the stopper, and agitate vigorously for 1 hour. Centrifuge a few mL, and test the supernatant liquid for iodides [acidify with dil. HNO₃ and add AgNO₃, a yellow precipitate of  AgI precipitates]. If the test is positive, add 2g of silver oxide additionally and continue to stand for 30 minutes with intermittent agitation. When the iodide completely reacted, filter the solution through a sintered glass filter. Rinse the flask and filter with three quantities, each of 50 mL of anhydrous toluene. Add the washing to the filtrate and dilute to 1000 mL with anhydrous toluene. Flush the solution for 10 minutes with dry carbon dioxide-free nitrogen.  Store the solution in a container protected from CO₂ and moisture. 

Standardization: Weigh accurately about 0.4 g of benzoic acid, dissolve in 80 mL of dimethyl formamide, add a few drops of 1% solution of thymol blue in dimethyl formamide as an indicator and titrate with tetra butyl ammonium hydroxide solution to give blue color as the endpoint. Protect the solution from atmospheric CO₂ throughout the titration. Perform a  blank determination and make any necessary corrections. 

Reaction:

Factor Calculation: 

1 mole of (C₄H₉)₄ N⁺OH⁻  ≅ 1 mole of benzoic acid 

1000 mL of 1M (C₄H₉)₄ N⁺OH⁻  ≅ 122.12 g of C₆H₆COOH 

1 mL of 0.1M (C₄H₉)₄ N⁺OH⁻  ≅ 0.01221 g of C₆H₆COOH

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