Part X. 



SOLUBILITY OF SILVER CHLORIDE, BROMIDE, AND SULPHO- 



CYANATE AT 100. 



106. OUTLINE OF THE INVESTIGATION. 



The solubility of many difficultly soluble salts at room temperature has 

 already been determined by several investigators* by means of measure- 

 ments of the electrical conductivity of the saturated solutions. The exten- 

 sion of such measurements to much higher temperatures is attended with 

 the difficulties that open vessels can not be used owing to evaporation 

 of the solvent, and that glass vessels are inadmissible owing to the con- 

 tamination of the solution resulting from them. The platinum-lined 

 bombs with quartz insulation recently constructed in this laboratory and 

 described in Part II, enable, however, such measurements to be made with 

 readiness and accuracy. One of these being placed at my disposal by 

 Professor Noyes, I took the opportunity of making a few solubility deter- 

 minations at 100, at which temperature the results have much practical 

 interest, owing to the frequent use of boiling solutions in analytical and 

 preparation work. Unfortunately the time available only permitted the 

 investigation of three salts. The results obtained with these, though not 

 so accurate as might have been secured if the bomb could have been 

 rotated within the bath, as will be done in later investigations in this 

 laboratory, seem, however, to deserve publication. 



107. DESCRIPTION OF THE EXPERIMENTS. 



The solubility determinations were made in the same bomb that had 

 been used just before by A. A. Noyes and Y. Kato (see Part VI), after 

 certain repairs had been made in it. It was provided with an open 

 cylindrical electrode of platinum-iridium. It was heated for the 100 

 measurements in the steam-jacketed xylene bath described in section 32, 

 Part IV. The conductance-capacity was determined by measuring in 

 the bomb at 18 the conductance of a 0.005 normal potassium chloride 

 solution and was found to be 0.1490, which was nearly identical with 

 an entirely independent result (0.1492) obtained about the same time by 

 Mr. Kato. 



*F. Kohlrausch and Rose, Z. physik. Chem., 12, 234; Holleman, ibid., 12, 125; F. 

 Kohlrausch, ibid., 44, 197 ; W. Bottger, ibid., 46, 521. 



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