VI.—On THE PRESENCE OF ACID SULPHATE OF COPPER IN 
MIXTURES OF AQUEOUS SOLUTIONS OF SULPHURIC ACID 
AND CoPpPpER SULPHATE —By CHARLES F. Linpsay, Dal- 
housve 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. MacGregor} 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 lee. They 
were calibrated for every 2 cc. 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. 
+ Trans. Roy. Soc. Canada, (2), 4, Sec. 3, 117, 1898-9. 
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