276 VII. EARTHS AND ALKALIES.-- 



from Tripoli. Both are washed for the sesquicarbonate of soda 

 they yield. — Over munnoo. Resembles trona; East Indies. 



SEsauicARBONATE OF SODA. Obtained from natron and 

 trona; composed of 4 soda, 4*125 carb. ac. and 2.25 water; 

 equiv. 10*375. Used in making soda water. 



Unrefined mineral alkali, Gaz oppoo. In regular very 

 thin whitish cakes ; having been dried in ponds : imported from 

 the East Indies. 



SuBCARBONATE OF SOD A^ Salt of sodttj Salt of barilla, Sal alkali. 

 Natron prceparatum, Sodce subcarbonas, Carbonas sodce, P. E. and- 

 D. Dissolve Spanish barilla ashes lib. in water 1 gall., filter 

 and evaporate to 21b., set it aside to crystallize ; antacid, deob- 

 struent, gr. x — 3ss, bis terve in die. — Officinal preparation, 

 Sodae subcarbona^ exsiccata, L, D. ; sodae carbonas, L, 



2. By calcining 1801b. ea. of Glauber''s salt and chalk, with 

 1101b. of charcoal dust, washing out the salt and crystallizing;^ 

 produces 3001b. of salt, of which 1001b. is pure subcarbonate of 

 soda. 



3. By mixing a solution of Glauber's salt with a solution of 

 lime in pure pyroligneous acid, boiling for some time, filtering, 

 evaporating to dryness, calcining the acetate of soda thus obtained, 

 redissolving in water, and crystallizing. 



4. Is obtained as a secondary product in making mineral 

 yellow. Composed of 4 soda, 2*75 carb. ac. and 11*25 water; 

 equiv. 18. Used largely in making hard soap, glass, and dyeing. 



Henry's carbonate of soda water. Dissolve subcarbonate 

 of soda in water, so that the solution may have the sp. gr. of 

 1*11 : 2 meas. are equal in saturating power to one of his carbon, 

 of potash water. 



SoD;E subcarbonas EXSICCATA, Carbouas sodcB siccatum. Melt 

 subc. of soda until it becomes dry, stirring it continually : 

 antacid; used also in calculous complaints, in small doses fre- 

 quently repeated, so as to take 3j to i j in the day. 



Bicarbonate of soda, Sodce carbonas, P. L. 1824. Pass 

 the gas from pounded marble dissolving in diluted sulphuric acid 

 through a solution of subcarb. of soda in water, as in making 

 bicarbonate of potash ; antacid, gr. x 9j. 



2. Calcine subcarb. of soda with bran, as in making bicarbo- 

 nate of soda; comp. of 4 soda; 5'5 of carb. acid, and 1*125 of 

 water ; equiv. 10*625 



Caustic soda. Pure soda, is prepared by acting upon sub. 

 carb. of soda with quicklime, as in making caustic potash. 



Soda prepared with alcohol. Also prepared in a manner 

 similar to potash. 



