Physical chemistry for physicians and biologists / by Ernst Cohen ; authorized translation from the German by Martin H. Cohen.
- Ernst Cohen
- Date:
- 1903
Licence: Public Domain Mark
Credit: Physical chemistry for physicians and biologists / by Ernst Cohen ; authorized translation from the German by Martin H. Cohen. Source: Wellcome Collection.
32/360 page 18
![If from these figures obtained by experiment the reaction veloc- ity k is to be calculated, by means of the equation Tes el t, SE t, GCs it must be noted, first of all, that at the time £, (= 2) the concen- tration (C,) in the 10 c.c. of the titrated reaction mixture amounts to 2 of the original concentration (#5 normal), wherefore 10 a il Ce 10: In the same way at ¢, (= 4 minutes) f BO C, = Thy x 40’ etc. The values of the third column, k, are therefore calculated as follows: 7.29 1 5.82 1 ee] an Sr ee AS? 7:20, SB eae 10 49 10 40 TOO 4.90 1 k : 2 =) 2 een, etc. ith opi we OO] nun ei As the table shows, the mean value of k, as calculated by this method, is 6.86. What is the significance of this figure, 6.86, from a chem- ical standpoint ? It shows that if 7; normal ethyl acetate is saponified by „5 normal NaOH at 25°, 6.86 mols of the ester are saponified per minute if 1 mol of the ester and 1 mol of the caustic soda are present per litre, and care is taken that the products of the reaction are constantly re- moved, and the decomposed ester and base are as con- stantly renewed.](https://iiif.wellcomecollection.org/image/b32861631_0032.jp2/full/800%2C/0/default.jpg)
