98 . BEMOVAL OF PHOSPHATE IONS, ETC. 



H Cl solution : Add an. excess of Na H. Filter and fuse the 

 precipitate with Na 2 CO 3 on platinum foil. Green color indi^ 

 cates Mn. To nitrate add H 2 S. White precipitate is Zn S. 



Notes. 1. An excess of NaOH forms a soluble compound with the 

 Zn, Na 2 Zn O 2 , which passes into the nitrate. The Mn is at the same 

 time precipitated as Mn (OH) 2 and converted by fusion with Na 2 C O 3] 

 to the compound Na., Mn O 4 , which is green in color. 



9. Procedure. The filtrate from 7 now contains only 

 the ions of the alkaline earth and alkali groups. These are 

 separated and identified in the usual manner. 



