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§ 60. BASES AXD ACIDS WITH EEAGENTS. 



bottom and plugs of asbestos in the upper parts of both 

 arms ; A is ^ |g filled with about 20 grms. of coarse grained 

 soda lime, and the remaining ^ |g at A' is filled with coarse- 



ly pulverized calcic chloride ; the arm h of the last U 

 tube contains calcic chloride, and the arm k' soda lime. 



The carbonic acid evolved in a is deprived of its water 

 and hydrochloric acid in ff' ; g enables the operator to 

 observe the rapidity of the flow of the gas, while the acid 

 is absorbed and weighed in ^^ and M'/ the contents of 

 JcJc' prevent carbonic acid and water from reaching the U 

 tube, hh\ from the atmosphere. 



Weigh out the substance in «, add water, weigh g and 

 hh' together, connect the various parts of the apparatus 

 with each other, and the little funnel d with 5, and put a 

 few drops of mercury in at d so as to close the tube at i. 



Pour the usual quantity of dilute nitric or hydrochloric 

 acid in at 6?, and, by suction at /, cause a little of the acid to 

 flow over into the flask ; regulate the flow of tlie gas by 

 slowly transferring fresh quantities of acid from h to a, 

 and applying a gentle heat to the contents of the flask. 



When the carbonate is completely decomposed, fill d 

 several times with hot water and transfer the same to a ; 

 then, substitute the calcic chloride tube e for the funnel c?, 



