498 Proceedings of Royal Society of Edinburgh. 
[sess. 
0*2 HC1 
Dissociation 
of Acid. 
•896 
k 
(Observed.) 
146-9 
fc(HCl) 
(Calculated.) 
Percentage 
Increase. 
Percentage 
Increase 
per 0'1 Salt. 
,, ,, +0T 
NaCl 
*882 
150-9 
144'6 
4-35 
4*35 
i) +0*2 
NnCl 
•872 
155-7 
143-0 
8-88 
4-44 
0-1 HC1 
•924 
71-8 
— 
— 
— 
,, ,, +0-05 KC1 
*910 
72 3 
70-7 
2-26 
4-52 
0*2 HC1 + 0-2 
KC1 
•871 
155*6 
142-8 
8-96 
4-48 
,, ,, +0’1 
LiCl 
•882 
151-6 
144-6 
4-84 
4-84 
„ „ +0-2 
LiCl 
•873 
154-5 
143-1 
8-00 
4-00 
„ „ +o-i 
MgCl 2 
•884 
151-3 
144-9 
4-42 
4-42 
)> >> +0'2 
MgCl 2 
•875 
155-6 
143-5 
8*44 
4-22 
They are similar in character to those already found for the 
inversion of cane sugar, and are mainly three, viz.: — 
The addition of a neutral chloride to hydrochloric acid increases 
the velocity with which the latter effects the catalysis of ethylic 
acetate ; the increase produced by any one salt is nearly propor- 
tional to the quantity added ; and the increase produced by equal 
quantities of all the salts examined is the same, within the experi- 
mental error, its mean value being 4*4 per cent, for the addition of 
OT normal chloride. 
To return again to the constants observed for solutions containing 
sulphuric acid and a sulphate, we must correct them for the accelerat- 
ing influence of the latter, and, according to the above results, at 
the rate of 4*4 per cent, for each Ol equivalent present per litre. 
Before these corrected constants are compared with those 
obtained for sulphuric acid alone, the latter must be subjected to 
a reduction for the same reason and in exactly the same manner 
as that described above for the hydrochloric acid constants, viz., 
for the change in dissociation produced by the addition of a 
neutral sulphate. The following example indicates (1) the correc- 
tion of a velocity constant obtained with a solution of acid and 
neutral salt, for the accelerating influence of the latter ; (2) the 
reduction of the corresponding velocity constant for acid alone, 
to the value it has when its degree of dissociation is equal to that 
which obtains in (1). 
Acid Solution . 
(1) 0*2H 2 SO 4 + 0TK 2 SO 4 
(2) 0-2H 2 SO 4 
Velocity Constant per 
Equivalent Acid. 
335 
411 
Corrected velocity constant for (1) = 
335 x 100 
104-5 
Dissociation 
of Acid. 
•524 
•539 
= 320 
5) 
)) 
( 2 ) 
411 x -524 
400 
Reduced 
•539 
