262 



On the Chemical & lamination of 



Estimation of Potassium. — To determine accurately the 

 quantity of potash, it was considered advisable to convert 

 any potash that might exist as sulphate into chloride, which 

 was effected in the following manner. From the solution of 

 the salts, the sulphuric acid was precipitated by chloride of 

 barium, and the sulphate of barytes separated by nitration. 

 The excess of barytes was then thrown down by carbonate 

 of ammonia. The liquor, after the carbonate of barytes had 

 been removed, was evaporated to dryness and heated to red- 

 ness, to expel the ammonia. The residue was dissolved in 

 water, and the potassium precipitated by the addition of the 

 sodium bichloride of platinum, as the potassium bichloride 



of platinum (KC1 PtCL). 



v 2 ibfii* 9iamoe 



(KC1 PtCl2) Potassium. 







30 grains gave 





310 



5-071 



Potassium, 

 per cent. 



16- 



ie: 



Estimation of Lime. — This was determined by precipita- 

 tion, as oxalate of lime ; the precipitate, when heated, was 



converted into carbonate of lime, 

 an- 



Carbonate of 

 Lime. 



1-49 -805 



2-33 1-300 



.. 132- ! 



400 grains gave 

 500 



Lime. 



Mean lime, per cent. 



Lime, 

 per cent. 



•201 

 •260 

 •230 





Estimation of Magnesia. — The magnesia was precipitated 

 from the solution of the salts by phosphate of soda and 

 ammonia, as ammonia-phosphate of magnesia, which was 

 converted by heat into the diphosphate of magnesia. 



Diphosphate of MaffI1Mla Magnesia, 



5.00 grains gave 

 400 



ignesia. 

 3-61 



1-312 

 1-071 



per cent. 



•264 



3-00 

 Mean magnesia, per cent., 



•267 



•277 



Results of Analyses of Soluble Salts. 



Sulphuric acid, 

 Sulphurous acid, . 

 Hyposulphurous acid, 

 Sulphur, 

 Phosphoric acid, . 



• 



4-915 

 •392 

 •135 

 •6616 

 •3245 



