The Phosphates of America. 



109 



With the analysis and this table before us, we may proceed to 

 find out in what proportions the powder and the liquid must be 

 brought together to transform the insoluble phosphates into a 

 water or citrate soluble form, and we acquire this knowledge by 

 resorting to an equation, which we will endeavor, as an example, 

 to produce in its simplest expression : 



Molecular Weights. 



310 



Ca 3 P 2 O 8 + 

 1 molecule of tri- + 

 basic phosphate of 

 lime 



196 



2H 2 SO 4 = 2CaSO 4 

 2 molecules of = 2 molecules gyp- 

 monohydrate sum 

 sulphuric acid 



CaH 4 P 2 O 8 

 1 molecule of 

 "super" or 

 acid-calcic 

 phosphate. 



Molecular Weights. 



100 98 



CaC0 3 + H a S0 4 =-- CaSO 4 

 1 molecule of + 1 molecule of = 1 molecule 

 carbonate of monohy- of gypsum 



lime drate sulphu- 



ric ac'd 



CO 8 + H 2 O 



1 molecule + 1 molecule 

 of carbon- of water 

 ic-acid gas or steam. 



Molecular Weights. 



245 



(AlP0 4 -) 2 

 1 molecule of 

 phosphate of 

 alumina 



294 



3H 2 S0 4 = 

 3 molecules of = 

 monohydrate 

 sulphuric acid 



A1 2 (S0 4 ) 3 

 1 molecule of 

 sulphate of alu- 

 mina 



(H 3 P0 4 ) 2 

 2 molecules 

 phosphoric acid. 



Molecular Weights. 



302 



(FeP0 4 ) 2 

 1 molecule of 

 phosphate o f 

 iron 



294 



3H 2 S0 4 = Fe 2 (S0 4 ) 3 + (H 3 PO 4 ) 8 

 3 molecules of = 1 molecule of + 2 molecules 

 monohy drate ferric sulphate phosphoric acid. 

 sulphuric acid 



Molecular Weights. 



