( 361 ) 
dnd, That the velocity of reaction is much accelerated by increasing 
the catalyser. 
3d, That the curves all end in the origin of the co-ordinates 
which means that the velocity of change in water without hydro- 
chlorie acid is zero so that the substance is stable therein. [Always 
on condition that light is excluded, (compare first communication) |. 
On comparing the two tables it will be also noticed that the 
velocity of reaction is greater in acetic acid than in alcohol; for 
instance, in a mixture of 200¢.c. of acetic acid and 15¢.c. of hydro- 
chlorie acid, k= 0.03385; when using 200 ¢.c. of alcohol and 15 e.e. 
hydrochloric acid k = 0.0201 *). 
If we compare the curves 4, I’, G and H we notice that on 
decreasing the concentration of the catalyser, the curves begin to 
approach the abscissa axis which again shows that, in the absence 
of hydrochloric acid, the velocity of change in acetic acid or aleohol 
is zero or in any case very small, which may also be seen from the 
curves A, B, C and D. 
A 100e.e. acet.acid with water to 500c.c. E10 e.e. HCI in 500 ec. solution. 
B 150 » » > » ye yD) #415. 4 > DTE . 
C 200 » » ) De Dee Gis D0 BEE DID aD ) 
D 950 » » » » ree DOD H 95 y » » ) > ) 
‘ | 
(a 
8 ° 
A 
A 
cc ICS 
10 15 20 25 ccHCE 
aceatic acid 
1) If we calculate number of mols. of alcohol or acetic acid to a given number 
of mols. of water we see that this difference in velocity of reaction is still greater. 
24* 
