259] METHOD OF ENTERING RESULTS 



Preliminary Examination for Acid-radicals 



75 



Wet Examination for Acid-radicals 



1. Heated substance with 

 dilute HC1, filtered, added 

 BaCl 2 and warmed 



2. Heated substance with 

 dilute HNO : „ filtered, and 

 added AgN0 3 



3. Heated substance with 

 water, filtered, added strong 

 HJ30 4 , cooled, and then 

 added cold FeS0 4 solution 



Faint white 

 precipitate 



Faint milki- 

 ness 



No brown ring 



Trace of sul- 

 phate 



Trace 



chloride 



of 



Nitrate absent 



Phosphate was shown to be absent in the wet examination for the 

 metals. 



Found : Ca, Mg-, water, carbonate, traces of sodium, 

 chloride, silicate, and sulphate 



