499 
1898-99.] Sulphuric Acid and Sulphates in Solution. 
The corrected and reduced constants thus obtained are then 
comparable, and the quotient, multiplied by 100, gives the per- 
centage of free acid in solution (1), viz., 80 ’0. 
The table below gives the percentages of free acid and the data 
for the calculation of the same, in the three series for sulphuric 
acid and potassium sulphate. They are arranged according to the 
following scheme. 
Kj = velocity constant for H 2 S0 4 (per equivalent). 
= „ „ „ when K 2 S0 4 
is present. 
= dissociation degree of acid. 
= „ „ when K 2 S0 4 is present. 
= K 4 x ^1 = reduced constant for H 9 S0 4 . 
a 
= corrected constant for H 2 S0 4 + K 2 S0 4 . 
= percentage of free acid in the solution of acid and salt. 
= X 100 
K 
First Series. 
Concentration of H 2 S0 4 = c. 
„ ,, K 2 SO 4 = 0T. 
c 
K x 
a 
«i 
K 
Tc 
1c x 100 
K 
0-025 
545 
278 
•693 
•547 
432 
267 
61-6 
0-05 
493 
294 
•630 
•543 
426 
281 
65-9 
0-1 
441 
317 
•560 
•536 
422 
303 
71*8 
0-2 
411 
335 
•539 
•524 
400 
320 
80-0 
0*35 
407 
355 
•522 
•514 
400 
339 
84-9 
