II.—On THE CALCULATION OF THE CONDUCTIVITY OF AQUEOUS 
SOLUTIONS CONTAINING HYDROCHLORIC AND SULPHURIC 
Acips.—By James Barnes, B. A., Dalhousie College, 
Halifax, N.S. 
(Communicated by Prof. J. G. MacGregor, on the 15th January, 1900.) 
The prediction of the conductivity of dilute aqueous solutions 
containing two electrolytes, which have one ion in common, has 
been shown to be possible, according to the dissociation theory, 
when the electrolytes are salts, or a salt and a diatomic acid 
such as hydrochloric acid." The experiments described in the 
present paper were made, at Prof. MacGregor’s suggestion, in 
order to ascertain if it is possible to make the prediction in the 
case of solutions formed by mixing hydrochloric and sulphurie 
acid solutions. 
The attempt to calculate the conductivity of a complex solu- 
tion containing sulphuric acid as one constituent is of special 
interest because of the fact that it is supposed to have a mode of 
ionization which varies with the concentration of the solution, 
its molecules in dilute solutions dissociating into 2 H and SO,, 
but in stronger solutions partly into H and H SO,. It is of 
course impossible to calculate the conductivity of a complex 
solution, one of the constituents of which has a mixed mode of 
ionization. I have therefore assumed that the mode of ioniza- 
tion in the moderately dilute solutions which I examined would 
be the same as it is usually supposed to be at great dilution. 
The conductivity of a mixture of two solutions of electrolytes 
1 and 2, with a common ion and definite modes of ionization 
1 MacGregor: Trans. N.S. Inst. Sci., 9, 101, 1895-6. 
McIntosh: Jbid., 9, 120, 1895-6. 
Archibald : Ibid., 9, pp. 291, 307, 1897-8. 
McKay: IJbid., 9, 321, 1897-8. 
Barnes: Ibid., 10, 49, 1898-9. 
Proc. & TRANS. N. S. Inst. Scr., Vou X. TRANS.—I. 
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