514 Proceedings of Royal Society of Edinburgh. [sess. 
Sodium and Lithium Acid Sulphates. 
On account of the close resemblance of the alkali metals, and 
the general analogy which exists between their corresponding salts, 
it was probable that the equilibria in solutions containing their 
respective acid sulphates would also he somewhat similar in nature. 
This conclusion is supported by the fact that the velocity constants 
obtained for the corresponding solutions of sulphuric acid and the 
sulphates of potassium, sodium and lithium are very nearly the 
same, those for the sodium salt being somewhat higher than those 
for the corresponding potassium salt solutions, and those for the 
lithium salt rather higher than either. This simply means that 
the percentage of free acid in corresponding solutions increases 
slightly in the same order, or that most acid salt is formed when 
sulphuric acid is added to a solution of potassium sulphate, and 
least when added to a solution of lithium sulphate. The experi- 
mental results were treated exactly as before, and I give therefore 
only the various tables for sodium and lithium sulphates. These 
correspond to the tables given for the first series of experiments 
with potassium sulphate and sulphuric acid, and are arranged in the 
same way. 
Sodium Sulphate and Sulphuric Acid. 
I. 
Arranged as on page 499. 
Concentration of H 2 S0 4 = c. 
„ „ Na 2 SO 4 = 0*l. 
c 
Ki 
k x 
a 
“i 
K 
k 
k x 100 
K 
0'025 
545 
280 
■693 
•548 
432 
268 
62-1 
0-05 
493 
300 
•630 
•544 
427 
'287 
67-3 
0*1 
441 
.324 
•560 
•537 
423 
310 
73-2 
0-2 
411 
340 
•539 
•525 
401 
324 
80-9 
0-35 
407 
356 
•522 
•515 
400 
340 
84-9 
In a paper on the influence of neutral salts on the catalysis of 
methylic acetate by acids, Trey (Joe. cit.) gives the results of several 
