14 " ' CHLCtHIpE 'O.F .-SILVER. 



and afterwards with a few drops of hydrochloric acid ; 

 the excess of acid having been expelled, the chloride 

 of silver is again heated to fusion, allowed to cool, and 

 weighed. 100 parts of AgCl contain 24.73 chlorine 

 (and 75.27 silver). 



The liquid in which the chloride of silver floats can 

 also be decanted with care on a filter. The chloride 

 can be collected in a weighed porcelain crucible, after 

 washing, dried, gently calcined, and weighed. The 

 chloride of silver being a little volatile, there is danger 

 of loss if it is heated to fusion. The filter is burned by 

 itself and the ashes weighed with the. calcined chloride. 



For the determination of the sodium, another weighed 

 portion of chloride of sodium is carefully moistened, 

 in a weighed platinum crucible, with concentrated sul- 

 phuric acid ; after some time, a gentle heat is applied 

 until all the chlorine has been expelled in the form of 

 hydrochloric acid, when the excess of sulphuric acid is 

 carefully evaporated, and the residual sulphate of soda 

 finally heated to redness, a fragment of carbonate of 

 ammonia being placed in the crucible, to decompose 

 any acid salt. From the weight of the sulphate of 

 soda, that of the sodium is calculated. 



2. CHLORIDE OF SILVER. 



AgOI. 



In order to determine the composition of chloride of 

 silver, a weighed quantity of pure silver is dissolved 

 in dilute nitric acid, the solution precipitated with 

 dilute hydrochloric acid, and the precipitated chloride 

 of silver treated as in No. 1. 



Or a weighed portion of fused chloride of silver may 

 be heated with a low flame; in a bulb-tube, through 



