260 CHROMATE OF POTASSA. 



acid diluted with five times its weight of water was used) be 

 poured upon the precipitate produced in the case of strontia, 

 it will be completely dissolved; whereas no impression is made 

 on that from the salts of baryta. 



Acetic acid, so concentrated as to crystallize when its temper- 

 ature was below 50°, was poured on the precipitated chromate 

 of baryta, and a portion of it taken up, but in no instance did 

 any quantity of the acid dissolve the entire precipitate. 



With the above means there need not now remain the least 

 doubt in ascertaining promptly the presence of baryta in a salt 

 of strontia supposed to contain it; for all that is necessary to 

 be done is to add to a solution of the salt a solution of chromate 

 of potassa, which, if baryta be present, will produce a light- 

 yellow precipitate insoluble in acetic acid. This re-agent will 

 also serve to distinguish baryta from lime. 



