VI. ON THE PRESENCE OF ACID SULPHATE OF COPPER IN 

 MIXTURES OF AQUEOUS SOLUTIONS OF SULPHURIC ACID 

 AND COPPER SULPHATE By CHARLES F. LINDSAY, Dal- 



housie College, Halifax, N. S. 



(Communicated on 8th May, 1899, by Prof. E. Mackay, Ph. D.) 



Anton Schrader* in a paper on the " Electrolysis of Mixtures,'' 

 measured the conductivity and other properties of solutions 

 containing mixtures of sulphuric acid and copper sulphate, 

 analysing his mixtures for the amount of acid present by titra- 

 tion. In his paper, no methods of any kind are given for the 

 analyses. Prof. MacGregorf has held that Schrader's results 

 point towards the presence of acid sulphate of copper in 

 the solution. At the suggestion of Prof. Mackay this work was 

 undertaken to find if any light could be obtained on this ques- 

 tion by chemical analytical methods. 



The work was carried out in the Chemical and Physical 

 laboratories of Dalhousie College, and consisted primarily in 

 making up solutions of sulphuric acid and copper sulphate, 

 analysing them, and determining their densities. In the begin- 

 ning the densities were taken only as a means of calculating the 

 concentration of the mixtures from the concentration of the 

 simple solutions. The work also included the purification of the 

 materials used, and the calibration of burettes and pipettes. 



Calibration of Burettes and Pipettes. 



All burettes and pipettes were carefully calibrated, by weigh- 

 ing the amount of water of known temperature which they 

 delivered. The burettes used could be read to .01 c.c. They 

 were calibrated for every 2 c.c. throughout their length. 



The pipettes, in emptying, were held against the side of the 

 vessel into which they were being emptied, the last drops of 

 water being removed by blowing sharply once. 



* Inaugural Dissertation, Berlin, 1897. 

 t Trans. Roy. Soc. Canada, (2), 4, Sec. 3, 117, 1898-9. 



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