To solution contain 



OUTLINE OF PROCESS. 

 ! of Fe, Al, Cr, Mn, Ni, Co, Zn. P0„ Ca. Ba, Sr, Mg, K, and Na, add NH^OH. Filter 



Precipitate may consist of Fe (OH)^, Al (0H),„ CinOH, ; 



also phosphates ot: Fe, AI, Or, Ni, Co, Mn, Ba, rSr, Ca, and Mg. 



Dissolve a small portion in dil. HNO„ and test for PO, ions with (NHJJIoOj. 



Test another portion for Fe'" with KJe (CN).. 



It POj ions are present : Dissolve ppt, in dil. HCl, remove PO, ions with 

 FeCl,. add NH.Cl and NH.OH. Filter. 



Filtrate may contain : 



If PO, ', 



'. not in excess — //' PO^ ' 



(a) Ions of Ni, Co, Mn, 

 Zn, Ba, Sr, Ca, 

 Mg, K, Na, and 

 NH^. 



Add H.S and filter. 



Ppt. ;— FePO,, Fe (OH), Al (0H),„ Cr (OH),. 

 Dissolve in dil. HCl, add NaOH and H,0,.. 

 Filter : 



Precipitate : 

 Fe (0H)„ 

 FePO,. 



Filtrate : 

 Na,A10, and Na.CrO^. 

 Divide into two parts. 



Acidify one part 

 with HC,H 0„ 

 and add 



Pb (C,H,0,),. 



Yellow ppt. : 

 PbCrO, 



To tlie other part 

 add first HCl and 

 then a slight ex- 

 cess of NH.OH. 



White ppt. : 

 Al (OH),. 



Filtrate may contain 



ions of : 



Mil, Ni, (Jo, Ba, Sr, 



Ca, Mg. 



Combine with filtrate (a). 



Precipitate may consist of : MoS, ZnS, NiS, CoS. 

 Add dil. HCl. (1 : 5) and filter. 



Residue, 

 NiS 

 and 

 CoS. 



Usual 

 separation. 



Filtrate contains ions of 

 Mn and Zn. Add excess 

 NaOH and filter. 



Precipitate : 

 Mn (OH),. 

 Fuse with 

 Na,CO,. 

 Green colora- 

 tion indicates 

 Mn. 



Filtrate con- 

 tains Na^ZnO, 

 Add H,S. 



Filtrate 

 tains only 

 ions of the 

 alkaline 

 earth gronp 

 and Mg. 



Separate 

 and identify 

 the usual 



White 

 irecipitate, | maniic 

 ZnS. 



[(NH,).MoO, test] 

 (6) Zn(NH,UOH). and 

 ions of Na, K, and 

 NH,. 



Pa.ss in H.S and filter. 



White 



precipitate, 



ZnS: 



Filtrate con- 

 tains ions ot 

 alkah gronp, 

 wliieh may be 

 separated and 

 identified in 

 the usual man- 



I 



