OF THALLIUM, INDIUM, AND TIN 



ELECTROMOTIVE FORCE BETWEEN TIN AMALGAMS. 



The tin amalgams were prepared in a manner similar to that employed 

 with indium. The electrolyte used in the cells was a solution of stannous 

 chloride, about half normal. Before use it was allowed to stand over pure 

 tin and was then preserved under hydrogen. Great care was taken to 

 insure the absence of stannic compounds. 



Since concentrated tin amalgams deposit a solid phase on cooling to o, 

 the first series of measurements were performed by the dilution of an 

 amalgam containing 0.66 per cent by weight of tin less than half of the 

 higher concentration used by Cady. As even this was found to separate 

 a solid at o, another series was made beginning with an amalgam con- 

 taining only 0.21 per cent of tin. 



The data concerning the preparation and dilution of these amalgams 

 were as follows: 1.0766 grams of metallic tin were dissolved in 161.161 

 grams of mercury to make amalgam Hi. This was diluted as follows : 



grams of amalgam. 



17.351 

 13.279 



10.391 



grams of mercury. 



+ 39-593 

 + 99-824 

 + 147-265 



in H2 

 H 3 

 H 4 



The more diluted series was made from a " parent " amalgam obtained 

 by dissolving 0.3116 grams of tin in 149.021 grams of mercury. From 

 this were prepared : 



grams of amalgam. 



18-537 



16.436 



9.919 



grams of mercury. 



+ 44.845 

 + II3.3I2 



+ 117-947 



in J2 

 J3 

 J4 



TABLE 4. Electrical Measurement of Tin Amalgams. 



