Answer to Question #165300 in Organic Chemistry for Tary

Question

 The following is a description of  an experiment  in which ethylbenyoate  is hydrolysed. 5cm (0.03 moles) of ethylbenzoate   are mixed with 30cm³  of 2M NaOH solution and heated under reflux  about 15minutes until all the oily drops have disappeared.  The flask is then filled for fractional distillation and the mixture distilled until the boiling point reaches 75⁰ to gwe a distillate "A".     

 The content of the flask are allowed to cool and then slowly acidified with concentrated hydrochloric acid when a precipitate "B" separates. This precipitate is purified by recrystallisation from water.

       a   Write the equation for the reaction between ethylbenzoate and NaOH solution

                                                                                     

       b.   Sketch the apparatus for heating the mixture under reflux

c. During distillation, where would you keep the bulb of the thermometer and why?

Answer 1

a)

b)

c) The bulb of a thermometer must be on the same level with the begining of the condenser. to meausre the correct temperature of vapors.