18 SOME NEW SALTS OF CADMIUM. 



Gal I 



tfa _l- 287.17- 5.47- 6.76 

 Ccl -2-1393.54-26.58-24.93 

 Br -3-2998.89-57.21-56.13 

 HO -5- 562.50-10.74-11.13 



5242.10 100.00 9S.95 

 It will seem from this that the bromide and chloride of cadmium 

 have a tendency to form bi-cadmiates, and di-cadmiates (sesqui-cad- 

 miates of Yan Hauer) while the iodide forms only mono-cadmiates. 



In preparing the above compounds the following observations were 

 made on the crystalized iodides of barium and strontium. 



Iodide of Barium may be prepared by digesting iodine with the 

 sulphide of barium, or with hydrate of baryta, and separation of the 

 iodate, the solution on evaporation yields fine needles of hydriodate of 

 baryta, according to Gay Lussac. The anhydrous salt is not deli- 

 quescent according to Gay Lussac, but very much so according to 

 Henry. The composition of the so-called hydriodate has not been 

 ascertained. 



The salt was prepared according to the second of the above men- 

 tioned methods, and also by neutralizing hydriodie acid with carbonate 

 of baryta. The solution yielded tolerably large yellowish prisms, 

 massed together so that the form could not be determined. In a 

 damp atmosphere they deliquesce, but in a dry one effloresce, forming 

 a white powder. 



When heated they melt in their water of crystalization, swell up 

 and decrepitate strongly, forming a white mass which fuses on further 

 application of heat, and on raising the temperature still higher 

 evolves iodine. The yellow color of the salt is due to the mother 

 liquor. 



1.071 lost on heating .. 0.273 = 25.49 Water. 

 1.803 " " 0.466 = 25.84 " 



1.803 gave sulphate of Baryta 0.804 = 26.20 Barium. 

 These numbers require the formula Ba 1 + 7 HO. 



Gal I 11 



Ba -1- 854.85-26.48-26 20 

 I -1-1585 57-49.13- 

 HO-7- 787.50-24.39-25.49-25.84 



3227.92 100.00 



Iodide of Strontium was formed in the same way ; it crystalizes in 

 six-sided tables, deliquescent in a damp, efflorescent in a dry atmos- 



