500 Proceedings of Royal Society of Edinburgh. [sess. 
Second Series. 
Concentration of H 2 SO 4 = 0*l. 
j> >j K 2 S0 4 =c. 
c 
K, 
Jc x 
a 
«i 
K 
Jc 
Jc x 100 
K 
0-4 
441 
191 
•560 
•507 
399 
156 
39-1 
0-2 
9 9 
245 
9 9 
•523 
411 
223 
54*3 
o-i 
317 
99 
•536 
422 
303 
71-8 
0-05 
9 9 
372 
9 9 
*545 
429 . 
363 
847 
0-025 
99 
405 
99 
*552 
436 
400 
91'9 
Third Series. 
Concentration of acid sulphate = c. 
c 
Kx 
a 
“i 
K 
Jc 
Jc x 100 
K 
0*2 
411 
270 
•539 
•515 
393 
246 
62*6 
0-15 
420 
291 
•547 
•524 
402 
271 
67-4 
o-i 
442 
317 
•560 
•536 
422 
303 
71-8 
0-05 
493 
368 
•630 
*556 
436 
360 
82‘4 
0-025 
545 
444 
•693 
•620 
488 
439 
90-0 
THE CONCENTRATIONS OF EREE ACID, NEUTRAL AND 
ACID SULPHATES, IN THE VARIOUS SOLUTIONS. 
Having thus determined what fraction of the total sulphuric 
acid originally present in any solution exists as free acid when a 
known quantity of potassium sulphate is added to it, the con- 
centrations of the free acid, and of the neutral and acid sulphates 
in the mixture are easily calculated. In the first series, for 
example, we find that 80 per cent, free acid exists in a solution 
