( 360 ) 
The modus operandi was as follows: 
A definite quantity (8 to 4 grams) of acetylchloranilide was dis- 
solved in respectively 100, 150, 200 and 250 ce. of 100 °/, acetic 
acid; to this were added 10, 15, 20 or 25 cc. of 28,67 °/, hydro- 
chloric acid and the mixture was finally diluted with water to 
500 cc. The experiments were then conducted as described in the 
4 
previous communication; by applying the formula 4 = 3 1 —_— the 
Ad 
k’s were calculated; ¢ is expressed in minutes. 
The following results have been obtained: 
in 500 of solution. 10 15 20 25 e.c. hydrochloric acid. 
on 7 Tr | B tu | 7 aT 
ENG 100 | 0.00506 | 0.00973 | 0.0189 0.0241 | 
| | 
EE MEIER 
=| 150 | 0.00846 | 0.0186 | 0.0318 0.0460 | 
=a) ree Kal wes 
en | | | 
iB | 200 | 0.0157 | 0.0335 | 0.0588 | 
o | | | 
hd 1 | ! | 
el | | | 
S | 250 | 0.0359 0.0719 | | | 
| | | 
| | | 
| reall | | | | 
| 300 | 0.0836 | | | 
hed SENTAAN | | 
in 500 of solution. 10 15 20 c.c. hydrochloric acid. 
BREA OAN Te | 
S| 200 | 0.00883 | 0.0204 | 0.0341 
ee Ee | 
= | | 
3 | 950 0.0158 | 0.0358 | 0.0591 | 
Oo | | | 
By means of these figures curves may be constructed either by 
taking the figures from a horizontal row or those from a column. 
The first row for instance shows how the velocity of reaction (con- 
stant) increases in 20°/, acetic acid in the presence of a varying 
amount of hydrochloric acid (10, 15, 20, 25 cc.) ete. 
In this manner the different series may be represented by the 
lmes UA, Bra “and? 1): 
The first column shows how the velocity of reaction changes with 
different concentrations of the acetic acid if the amount of the 
catalyser is constant. These columns are represented by the lines 
E, F, G and H. The alcoholic solution has been represented in 
the same manner (A’, B’; C’, D’, E’). 
These curves show: 
1s*. That the velocity of reaction, both in acetic and alcoholic 
solution, is decreased by addition of water. 
