1898-99.] Sulphuric Acid and Sulphates in Solution. 
493 
Velocity Constants per equivalent H 2 S0 4 . 
Number of 
Experiment. 
k 2 so 4 
Na 2 S0 4 
Li 2 S0 4 
I. 
1st Series 
278 
2nd Series 
191 
3rd Series 
270 
1st Series 
280 
1st Series 
282 
II. 
294 
245 
291 
300 
306 
III. 
317 
317 
317 
324 
326 
IV. 
335 
372 
368 
340 
344 
V. 
355 
405 
444 
356 
363 
The percentage of free acid in a solution containing sulphuric 
acid and a neutral sulphate was obtained by comparison of the 
velocity with which it effected the catalysis of the ester, with the 
velocity measured in the case of sulphuric acid alone, of the same 
concentration. I therefore determined the velocity constants with 
sulphuric acid of varying concentrations. The following are the 
experiments : — 
I. 
H 2 S0 4 0‘01 normal. 
t 
X 
E — £C 
Tc 
1334 
314 
1542 
6*05 
2741 
589 
1267 
6-06 
4245 
829 
1027 
6-06 
5764 
1029 
727 
6*09 
7104 
1167 
689 
6*06 
CO 
1856 
— 
6-06 
II. 
III. 
H 2 S0 4 0’1 normal. 
H 2 S0 4 0*5 normal. 
t 
x E-x 
Tc 
t 
x E - x 
Tc 
136 
246 1646 
44*5 
57 
222 732 
2017 
286 
474 1418 
43-8 
170 
528 426 
205-9 
448 
693 1199 
44-2 
213 
598 356 
201 -0 
1280 
1377 515 
44*2 
246 
650 304 
201-9 
1767 
1576 316 
44’0 
371 
782 172 
200-6 
CO 
1892 — 
441 
oo 
954 — 
201*5 
From these observed velocity constants, the values per equivalent 
of the acid were calculated. The velocity constant at any inter- 
