1009 
with the communication by ScHorr (I. ¢.) a change takes place in 
the salt mol. under the influence of the free acid. By measuring 
the power of the bases which are the foundation of the different 
salts, I have endeavoured to get an insight into the nature of 
this change. 
For this purpose I have observed their catalytic influence on the 
saponification of ethyl acetate and on the inversion of sucrose at 
25°. The velocity constants of the salts (4”) were compared with 
those of equivalent quantities of free hydrochloric acid (h). 
The catalytic influence of the neutral salt molecules of the oxime 
was compensated as much as possible in the free acid by the addition 
of varying amounts of common salt which were so chosen as to 
correspond with the non-hydrolysed portion of the oxime salts. We 
Ke! 
may then put the degree of hydrolysis as tap From this, the 
dissociation constant of the base may be caleulated from the formula 
ln — in which / represents the ion-product of water 
(1,1. 10-H at 25°) and NV the normality of the solution. There was 
found on: 
Saponification with the salt containing 1 mol. of oxime to 1 mol. of HCI 
N . salt ke“ N. HCI k wv kp.10=18 
0,050 3,857 0,050 + 0,03 NaCl 14,72 0,2620 23,85 
0,100 5,712 0,100+ 0,08 ,, 29,60 0,1930 24,05 
0,200 8,859 0,200+ 0,16 „ 62,40 01419 23,65 
Saponification with the salt containing 3 mols. of oxime to 1 mol. of HCI. 
0,050 8,047 0,050 + 0,02 NaCl 14,22 0,5659 3,007 
0,100 13,52 0,100 + 0,05 — ,, 29,47 0,4587 2,854 
0,200 21,37 0,200 +013 „ 62,28 0,3431 3,097 
Saponijication with the liquid salt containing about 2 mols. of oxime 
to 1 mol. of HCl. 
Here x nearly becomes = 1 so that £; cannot 
| be determined from this with suffieient accuracy. 
} kp is, however, much smaller than in the case 
| of the previous salts. 
0,050 _ 13,7 
0,100 27,7 
Inversion with the salt containing 3 mols. of oxime to 1 mol. of HCI. 
65* 
