Quantitative hydrolysis of ethyl benzoate

Quantitative Hydrolysis of Ethyl Benzoate -The quantitative estimation of an ester Ijy hycliolysis is conducted as follows a standaid half-normal solution of alcoholic potash is prepared by dissolving 7 grams of caustic potash m about an equal weight of water and diluting to 250 c.c. with absolute alcohol. The liquid is alloived to stand ovei night in a stoppered 

A volume corresponding to about I gram is delivered into a round flask (200 c.c.) by attaching a piece of lubber tubing to the wide end of the apparatus and blowing until the liquid descends to the required graduation on the wide limb. Twenty-five c.c. of the standard alcoholic potash solution is added, and the mixture boiled on the water-bath wuth reflux condenser for twenty minutes. 

The amount of free alkali is estimated by titration w ith standard sulphuric acid and the quantity of ester calculated. 

Friedel, Crafts, Ann. Chi7 i. Phys., 1884, 1, 507 14, 455. 30 grms. benzene. 

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