Eee ee eee 
= : 
Analysis of Sea Water. 49 
its quantity was likewise ascertained after the distribution of the 
acids amongst the bases, when the surplus of the lime or of one 
of the other bases must have been united to carbonic acid. The 
quantity obtained by analysis was a little less than the last, ow- 
ing to the carbonate of barytes not being entirely insoluble in 
water during lixiviation. Lime was separated by oxalate of am- — 
monia, the water having been previously mixed with a proper 
quantity of chloride of ammonium. After the separation of lime, 
magnesia was precipitated by the addition of ammonia and phos- 
phate of ammonia. 
The precipitate was washed with water containing 10 per cent. 
__ of ammonia, whereby the solution of the precipitate was preven- 
_ ted. After the sea-water had been freed from the earthy chlo- 
rides and sulphates by hydrate of barytes and carbonate of am- 
monia, it was evaporated to dryness, and the residue heated to 
redness, and weighed. The alkaline chlorides were dissolved in 
water mixed with perchloride of platinum, and evaporated to dry- 
ness. ‘The residue digested with spirits of wine containing 60° 
per cent. alcohol, left potassio-chloride of platinum, which was 
dried, weighed, and computed as chloride of potassium. The ~ 
surplus of the total amount of the alkaline chlorides will give the 
_ precise quantity of the chloride of sodium. 
The equivalent numbers have been computed according to the 
tables which H. Rose has affixed to his Handbuch der Analy- 
 tischen Chemie, Zweiter Band. 
I subjoin by way of comparison an 1 analysis of the Mediterra- 
_nean by Laurens. (Journal de Pharmacie, ami, 93.) . 
Sea-water of the British Channel. Of the Mediterranean. 
zrains. rains 
Water, - <-° = “<= 42. O64 743720 - + = 959-26 
Chloride of sodium, - -. 27:05948 - - - 27-22 
: — of potassium, =e 076362 4 = - - .*001 
nesium, - 366658 - - - 614 
——__—_ of mag 
Bromide of magnesium, - 002929 = 
Sulphate of magnesia, == 
of lime, age 
Sainte oflime, -  - - 
1000,00000-. the 
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