Question

se amesteca 200 g sol acid acetic de conc 60% cu 110 g solutie alcool etilic 41,82% si 44 g de acetat de etil .Se adauga cateva picaturi sol de acid sulfuric si se incalzeste amestecul pana la stabilirea echil. Cunoscand concentratia procentuala masica in amestecul final 17.41% determinati constanta de echilibru.

Answer 1

                     CH3COOH       +      C2H5OH       ⇄     CH3COOC2H5      +       H2O
initial :                2mol                        1mol                             0,5 moli                  8 moli
au reactionat     x                                 x
la echilibru :     (2-x)                         (1-x)                            (0,5+x)                     (8+x)
m amestec = 200+ 110 + 44 = 354g
(0,5+x)·88·100/354= 17,41    0,5+x = 1,427     x = 0,9278
Kc = [ester][apa]/{[acid][alcool]} = 1,427·8,9278/(1,0722·0,0722) = 164,57