36 MATERIA MEDIC A AND THERAPEUTICS. 



Impurities. Carbonate and its impurities. 

 Dose. 10 to 60 gr. 



Preparations. 



a. Liquor Sodse Effervescens. Soda "Water. 

 Made like potash, water. 30 gr. in 1 pint. Dose, 

 Ad libitum. 



. Trochischi Sodaa Bicarbonatls, 5 gr. in 

 each. Dose, 1 to 6. ,',, . 



7. Sodse Citro-Tartras Effervescens. Eff er- 

 vescent Citro-tartrate of Soda. White granules, 

 deliquescent; made by heating the Bicarbonate 

 with Citric and Tartaric acids, stirring assiduously. 

 Dose, 60 to 120 gr. 



c. Liquor Sodse. Solution of Soda. NaHO (4-1 

 per cent.) in water. 



Source. Prepared by boiling a solution of Carbonate 

 of Soda with Slaked Lime. Na 2 C0 3 + CaH 2 2 = 2NaHO 

 + CaCO 3 . 



Characters. A colourless alkaline liquid. 



Impurities. Lime, carbonates, sulphates, chlorides. 



Dose. (Rarely given) 10 min. to 1 il.dr. 



from Liquor Soda are made : 



a. Soda Caustica. Caustic Soda. NaHO. 



Source. Made by boiling down Liquor Sodae. 



Characters. Hard greyish -white fragments, 

 slightly deliquescent, very alkaline. 



Impurities. Same as of liquor. 



fi. Sodae Yalerianas,. See Valerians Radix. 



d. Sodse Acetas. Acetate of Soda. NaC 2 H 3 O a . 

 3H 3 0. 



Source. Made by acting on Carbonate of Soda by 

 Acetic Acid. 



Characters. Transparent colourless crystals. Used 

 } only to make ferri arsenias, ferri phosphas, and syrupus 

 \ ferri phosphatis. 



e. Soda Tartarata. Tartarated Soda. NaK. 

 C 4 H 4 6 .4H 2 0. Tartrate of soda and potash. Rochelle 

 salt. 



Source. Prepared by boiling Acid Tartrate of Potash 

 in a solution of Carbonate of Soda, and crystallising ; 

 Na a C0 3 + 2KHC 4 H 4 O 6 = 2NaK.C 4 H 4 O 6 4- H,O +C0 <2 . 



Characters. Colourless transparent right rhombic 



