564 



fairchiIvD: mineral, sulphide water 



TABLE 3 

 Table Showing the Additional Effect of MgCU 



The alkalinity of this water as determined by titration with 

 Ar/20 HCl was equivalent to 0.928 gram NaOH per liter. This 

 amount was divided in terms of NaOH as follows : 



TABLE 4 

 Equivalent Radicals in Terms of NaOH in Grams per Liter 



The difference between the two totals obtained is only 6.5 

 per cent, a fairly close agreement after the errors liable to occur 

 in individual determinations are taken into consideration. 



A final solution containing 4.7 gm. MgS04.7H20, 7.3 gm. an- 

 hydrous CaClo, 100 cc. AVio NaSH, 0.84 gm. NaHCOs, and 15 

 gm. NaCl per liter was prepared. An excess of CaCOs separated 

 out, leaving the solution saturated with calcium bicarbonate. 

 The carbon dioxide remaining in solution was 0.313 gm. per 

 liter, and the sulphur was 0.278 gm. per liter. A test on 100 cc. 

 of this solution gave: fixed CO2, 73.5 per cent; volatile sulphur, 

 89.2 per cent. Upon comparing all the figures obtained, it will be 

 observ^ed that although no relation exists between the total car- 

 bonate and the total sulphur, yet a relation does exist between 

 the fixed or volatile sulphur and the total sulphide. 



Summary. — The alkahnity of a water containing a mixture of 

 the sulphohydrates and bicarbonates of the alkalies and alkahne 

 earths appears to increase continuously with the escape of hydro- 



