The Hydrogen-ion Concentration, etc., of Sea-Water. 



63 



some of the Na 2 CO 3 used in standardizing the HC1, and weighed with 

 standardized weights. The total COz as calculated and found in this 

 solution differed by about 0.5 per cent. 



Dole used a simpler (titration) method for determining the CC>2 in 

 sea-water, but we have not yet had time to compare it with our 



17 



Grams of chlorine per liter 

 18 19 20 



22 at ?(F 



IS 



18 19 20 



Grams Cl per kilogram of solution 



21 



22 



FIQ. 22. Conversion table for finding the absorption coefficient of acidified sea-water for 

 CO. This table was taken from the center of a graph plotted from Bohr's data on the 

 absorption coefficients of distilled water and solutions of NaCl for CO? on the assumption 

 that the absorption coefficient of sea-water and salt solution of the same Cl content are the 

 same, provided the sea-water does not contain alkali to combine with the COj. The error 

 that may be the result of this assumption is necessarily minute and insignificant compared 

 with errors that might arise from slightly incorrect thermometers. Each diagonal is for 

 a different temperature. The grams of Cl per kilogram of sea-water are indicated below and 

 grams of Cl per liter of sea-water at 20 and again at 30 is indicated above. 



