100 PRACTICAL ORGANIC CHEMISTRY The residual liquid in the flask is a dilute alkaline solution of sodium acetate. To liberate the acetic acid, add dilute sulphuric acid until the solution is definitely acid to litmus, and then distil off about 20 ml. Perform on this aqueous distillate the tests for acetic acid given on p. 347-Hydrolysis of Ethyl Acetate (Semi-Micro Scale) The hydrolysis of as little as 0-5 ml. of the ester can be carried out in the combined "reflux-distillation" apparatus shown in Fig. 38 (p. 63). Pass a stream of cold water through the vertical condenser. Place in the 10 ml. pear-shaped flask 0-5 ml. of the ester, 5 ml. of 10% NaOH solution and one or two minute fragments of unglazed porcelain and heat the mixture gently for 15 minutes so that the vapours do not rise more than about half-way up the vertical water-condenser. Now run the water out of the vertical condenser, insert a thermometer at the top, and pass water through the inclined condenser. Heat the flask sufficiently strongly to collect 1-2 ml. of distillate. This is dilute ethanol.
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.