5G0 ROSE ON THE ANHYDROUS SULPHATE OP AMMONIA. 



of strontium ; after some time, however, if the solutions are not 

 too dilute, precipitation begins in that of the deliquescent salt, 

 while that of the sulphat-ammon remains clear. A solution of 

 the acetate of peroxide [protoxide ?] of lead precipitates the solu- 

 tion of the deliquescent salt in the same way that it does the 

 sulphat-ammon ; a solution of chloride of calcium does not 

 render either solution turbid ; both solutions are similarly 

 affected by chloride of platina, sulphate of alumina, tartaric 

 acid, racemic acid, and carbazotic acid. 



It is difficult to prevent the solution of the salt from reacting 

 as an acid upon litmus papei", but it is inconsiderable if the 

 salt has been carefully prepared. 



The salt obtained by evaporating the solution in vacuo was 

 dried at 212° until it ceased to lose weight ; 100 parts of the dried 

 salt dissolved in water, mixed with a solution of chloride of 

 barium, and left in the cold for twenty-four hours, gave 20*42 of 

 sulphate of barytes. Hydrochloric acid being added to the 

 filtered solution, it was evaporated to dryness, and the residue 

 was heated nearly to redness, and treated with hydrochloric 

 acid. The quantity of the sulphate of barytes precipitated was 

 166'18 parts; the quantity of sulphate of barytes, precipitated 

 in the cold, therefore, amounts to scarcely one-eightli of the 

 whole ; both quantities together gave G4"14 percent, of sulphuric 

 acid in the salt; this corresponds to a compound of anhydrous 

 sulphate of oxide of ammonium, with half an atom of water, 



which, calculated according to the formula S N H'^ -h ^ H gave 

 in 100 parts 



Sulphuric acid 64*93 



Ammonia 27*79 



Water 7'28 



100- 



On repeating this experiment with a portion of the salt pre- 

 pared on another occasion by dissolving pure sulphat-ammon, I 

 obtained, by exposure to cold from 100 parts, after adding hy- 

 drochloric acid and chloride of barium to the solution, 106*06 

 parts of sulphate of barytes, and from the residue obtained by 

 evaporation to dryness, and treating It with hydrochloric acid, 

 84*62 parts more of sulphate of barytes were obtained. It will 

 be seen from these experiments that much more sulphuric acid 



