III. ON THE CONDUCTIVITY, SPECIFIC GRAVITY AND SURFACE 

 TENSION OF AQUEOUS SOLUTIONS CONTAINING POTASSIUM 

 CHLORIDE AND SULPHATE. BY JAMES BARNES, B. A., 



Dalhousie College, Halifax, N. S. 



f Communicated on May 10th, 1899, by Prof. J. G. MacGregorJ 



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 1 chlorides or two 2 sulphates, 

 with data as to the conductivity and the other physical properties 

 obtained by observations on simple solutions of these salts. 



At Prof. MacGregor's suggestion,! have carried out the experi- 

 ments described in this paper, with the object of testing this 

 possibility for a solution containing a chloride and a sulphate 

 with a common cation. 



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 J 898-99. 



Apparatus and Methods. Chemical Analysis. 



The salts were obtained from Eirner & 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 Mclntosh, Trans. N. S. Inst. Sci., 9, 120, 1805-6. 

 McKay, Trans. N. S. Inst. Sci.. 9, 321, 1897-8. 



2 Archibald, Trans. N. S. Inst. Sci., 9, pp. 291, 307, 335. 



3 Wied. Ann., 21, 576, 1884. 



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