64 Messrs. Merck and Galloway's Analysis of 



and potassium = 0*0378 grm. of chloride of potassium 

 = 0*00597 per cent, of chloride of potassium, which equals 

 0*00377 per cent, of potassa. 



II. 546*032 grms. of water, or 0*2538 grm. of the mixed 

 chlorides, gave 0*0975 grm. of chloride of platinum and po- 

 tassium = 0*02977 grm. of chloride of potassium = 0*00545 

 per cent, of chloride of potassium, which equals 0*00342 per 

 cent, of potassa. 



Mean of the results, 0*00571 per cent, of chloride of potas- 

 sium and 0*0359 per cent, of potassa. 



9. Estimation of the Soda. 



The quantity of soda was found simply by the difference 

 of the mixed chlorides and the quantity of chloride of potas- 

 sium found by direct estimation. 



Mean of the mixed chlorides . . . 0*04645 

 Mean of the chloride of potassium . 0*00571 



Chloride of sodium . . 0*04074 



corresponding to 0*02168 per cent, of soda. 



10. Estimation of Carbonic Acid. 



To find the quantity of free carbonic acid contained in the 

 water at the moment it was taken from the well, a siphon of 

 exactly known capacity was immersed in the well, and the 

 water obtained in this way put in bottles, containing a mix- 

 ture of ammonia and chloride of calcium. In this way the 

 free carbonic acid as well as the carbonic acid in combination 

 was precipitated in the form of carbonates. Four bottles were 

 filled with mineral water by this method. The capacity of 

 the siphon was exactly 533 cubic centimetres, therefore 

 533 X 4 X 1*0025 = 2137 grms. of water were taken. 



The precipitate from the water contained in these four bot- 

 tles was collected, washed, dried and weighed; it yielded 

 1*4748 grm. of carbonate mixed with some alumina from im- 

 purity in the solution of chloride of calcium. 



To estimate the quantity of carbonic acid in this precipitate, 

 tw^o portions of it were taken and estimated separately after 

 the method proposed by Drs. Fresenius and Will. 



I. 0*66 grm. of the carbonate, &c. gave in this way 0*22 

 grm. of carbonic acid, therefore 1*4748 grm. of the carbonate, 

 or 2137'0 grms. of water, gave 0*4916 grm. of carbonic acid. 



II. 0*718 grm. of the carbonate, &c. gave 0*23 grm. of car- 

 bonic acid, therefore 1*4-748 grm. of the carbonate, &c., or 

 2137*0 grms. of water, gave 0*4718 grm. of carbonic acid. 



