§ 94. QUANTITATIVE METHODS. 161 



tie hot water, and dissolve it, without ignition, either in 

 nitric acid and eliminate phosphoric acid with the aid of 

 amnionic molybdate (§ Gl, 5), or in hydrochloric acid and 

 precipitate the phosphoric acid with magnesia mixture in 

 the presence of citric acid, as above. 



(4.) If there is a large proportion of pliosphoric acid in 

 the substance, and comparatively little ferric oxide and 

 alumina, the nitric acid solution, obtained as in 1, may be 

 treated with metallic tin, as described in B. 



94. Schemes for the quantitative se2:>aration of K.^ iVa., 

 Ga., My,, Fe., Al, Mn., P, 0,, a?id jSO^. 



The purpose of these schemes is, to present a birds- 

 eye view of the various courses to be followed for the 

 separation of the bases and acids given in this list. 



For the details of the manipulation the analyst should 

 always follow up the references given in the schemes and 

 in § 93, unless he is perfectly familiar with these details, 

 and knows them, as it were, by heart. 



The capital letters in the schemes refer to paragraphs 

 in § 93, the small letters to other parts of the schemes 

 themselves. 



