IiJ].—On tHE CoNnpDUCTIVITY, SPECIFIC GRAVITY AND SURFACE 
TENSION OF AQUEOUS SOLUTIONS CONTAINING POTASSIUM 
CHLORIDE AND SULPHATE.—By JAMES BARNES, B. A, 
Dalhousie College, Halifax, N.S. 
(Communicated on May 10th, 1899, by Prof. J. G. MacGregor.) 
In papers read before this Society it has been shown that it 
is possible, by the aid of the dissociation theory of electrolytic 
conduction, to predict the conductivity and other physical pro- 
perties of a solution containing two’ chlorides or two? sulphates, 
with data as to the conductivity and the other physical properties 
obtained by observations on simple solutions of these salts. 
At Prot. MacGregor’s suggestion, I have carried out the experi- 
ments described in this paper, with the object of testiag this 
possibility for a solution containing a chloride and a sulphate 
with a common eation. 
The electrolytes selected were potassium chloride and sul- 
phate. The observations on conductivity and specific gravity 
were made by the writer, while *Rother’s observations on surface 
tension were used. The observations were made in the Physical 
and Chemical Laboratories of Dalhousie College, Halifax, during 
the session of 1898-99. 
Apparatus and Methods.—Chemical Analysis. 
The salts were obtained from Eimer & Amend of New York, 
as chemically pure. They were re-crystallized twice. No traces 
of iron or sodium were found in the salts. For the detection of 
iron, the ammonium sulphocyanide test was applied; for 
sodium, the flame test. 
The water used in making the solutions was_ puri- 
fied by boiling ordinary distilled water with a few 
1 McIntosh, Trans. N.S. Inst. Sci., 9, 120, 1895-6. 
McKay, Trans. N.S. Inst. Sci., 9, 321, 1897-8. 
2 Archibald, Trans. N. S. Inst. Sci., 9, pp. 291, 307, 335. 
* Wied. Ana., 21, 576, 1884. 
PROG. 6 (DRANS: Nes) INST. SCE, Von. 5X. TRANS.—D. 
GED) 
