806 Mr. Schweitzer on an Analysis of the 



with carbonate of ammonia and evaporated nearly to dryness, 

 to free it from the surplus of the barytes salt. Having sepa- 

 rated the carbonate of barytes, the fluid thus obtained was 

 evaporated, and the residue heated to fusion in a well-covered 

 crucible. The alkaline chlorides were dissolved in water and 

 mixed with a surplus quantity of perchloride of platinum, and 

 evaporated in a temperature of 175° F. nearly to dryness; the 

 residue was macerated with spirits of wine (containing 60 per 

 cent, of alcohol) as long as anything dissolved, when potas- 

 sio-chloride of platinum was left behind weighing 6*036 grs., 

 equivalent to 1'167 gr. potassa. 



8. Soda. — The usual way of ascertaining the amount of 

 soda is by an indirect method. This has no difficulties with 

 alkaline mineral waters ; the amount of soda is obtained when 

 the whole amount of the ingredients found by analysis in the 

 fluid containing the soluble salts is deducted from the whole 

 weight of the alkaline salts obtained by evaporation ; however, 

 this method cannot be applied where mineral waters have no 

 alkaline carbonates, and where carbonate of soda has been 

 added to the water, which by the presence of earthy chlorides, 

 &c. has been rarely changed into chloride of sodium. 



The following method I employed here for ascertaining the 

 soda by calculation : — It is requisite to arrange the ingredients 

 established by analysis into binary combinations. Potassa, 

 as the strongest and only base* ascertained, is united to sul- 

 phuric acid, and the surplus of the latter with the other elec- 

 tro-negative ingredients must therefore have been in combi- 

 nation with soda. The nitric acid has existed as nitrate of 

 soda; this acid, however, in conjunction with organic matter 

 at the high temperature at which the soluble ingredients were 

 fused, has become decomposed, forming with soda carbonate 

 of soda, an assumption established by facts. 

 grs. grs. 



1. 1*167 potassa give 2*158 sulphate of potassa. 



2. 4*950 sulphuric acid, 



less 0*991 united with potassa, 

 leaves 3*959 sulphuric acid^ give 7*047 sulphate of soda. 



3. 1*122 nitric acid give 

 1*7697 nitrate of soda, 



equivalent to 1*106 carbonate of soda. 



4. 9*533 chlorine give 15*798 chloride of sodium. 



5. 0*005 iodine give 0*006 iodide of sodium. 



6. 0*053 bromine give 0*069 bromide of sodium. 



7. 0*011 magnesia. 



Total 26*195 



* With the exception of a small quantity of magnesia which was united 

 to soda. 



