INORGANIC COMPOUNDS. 179 



drops of nitric acid have been added, and then bring the whole 

 precipitate on the filter. Wash thoroughly with hot water 

 (test the wash- water with hydrochloric acid), and dry the 

 filter with its contents. Shake out the perfectly dry silver 

 chloride as completely as possible on a piece of black glazed 

 paper and cover it with a funnel. Place the folded filter in 

 a weighed porcelain crucible, heat at first gently and then 

 until the carbon is completely burned, let cool, drop on the 

 ash in the crucible one to two drops of nitric acid (with a 

 pipette), then one to two drops of hydrochloric acid, and 

 evaporate the acids with extreme caution (water-bath or 

 gently heated sand-bath, etc.). Heat somewhat more 

 strongly, let cool a little and add the silver chloride from the 

 glazed paper, carefully avoiding any loss (by using a brush 

 or feather to remove the last traces of chloride). Heat the 

 crucible gently till the chloride just begins to melt, let cool, 

 and weigh. 143.38 parts of silver chloride correspond to 

 35.45 of chlorine. Sodium chloride contains 60.59 per cent, 

 of chlorine. 



In order to remove the silver chloride from the crucible 

 fill it half-full of dilute sulphuric acid, put in a piece of zinc, 

 and let stand till next day. The silver chloride is reduced 

 to metallic silver, which may easily be removed from the 

 *crucible. 



