SALTS OF THE OCEAN. 



943 



Combining acids and bases, we have the following average composition 



of sea salt:" 



' Percentages of salts in sea ivater. 



Chloride of sodium 



Chloride of magnesium 

 Sulphate of magnesium 



Sulphate of lime 



Sulphate of potash 



Bromide of magnesium 

 Carbonate of lime 



Total 



From the above table the percentages of the different elements in the 

 ocean salts are calculated as follows: 



Percentages of elements in sea salt. 



The total amount of these compounds as calculated by Dittmar is 

 46,283,000,000,000,000 tons, or 46,283 (10 12 X 1,000) kilograms. The 

 amounts of the different compounds are given in the table below. 6 



Total amounts of salts in the ocean. 



[Unit=10 12 metric tons.] 



Chloride of sodium (NaCl) '. 35,990 



Chloride of magnesium (MgCL,) 5, 034 



Sulphate of magnesium (MgS0 4 ) 2, 192 



Sulphate of calcium (CaSOJ 1, 666 



Sulphate of potash (K 2 SO t ) 1,141 



Bromide of magnesium (MgBr,) 100 



Carbonate of calcium (CaC0 3 ) 160 



46, 283 



« Dittmar, Narrative of the cruise, cit., p. 954. 6 Dittmar, cit., p. 980. 



