POTASSIUM BICA.EBONATK 125 



PoTASSii BiOABBONAS. Potassium Bicarbonate. KHCo, 

 (U. S. & B. P.) 



%nora?/m.— Doppelkohlejisaurfts kali, G. 



Derivation. —Obtained by passing a stream of Coj through 

 a solution of the carbonate. 



K,C03. + CO, + H,0 = 2 KHC03. 



Properties. — Colorless, transparent, monoclinic prisms, 

 odorless and having a saline and slightly alkaline taste. 

 Permanent in the air. Soluble in 3.2 parts of water. Almost 

 insoluble in alcohol. Becomes converted into the carbonate 

 by boiling. 



Z»ose.— H. & C, § ss.-i. (15.-30.); Sh. & Sw., 3 ss.-i. (2.-4.); 

 D., gr.v.-xx. (.3-1.3). 



Preferable to carbonate for internal use, as it is less 

 irritating. 



PoTASsn AoETAS. Potassium Acetate. K-C^HjOj 

 (U. S. & B. P.) 



Synonym. — Terra foliata tartari, E.; Bssigsaures kali, G. 



Derivation. — Add acetic acid in excess to potassium 

 carbonate. Evaporate to dryness and fuse residue. 



K,C03 + 2 HCH^O, = 2 KC,H30, + H,0 + CO,. 



Properties, — A white powder, or crystalline masses of a 

 satiny lustre ; odorless and having a warming, saline taste. 

 Very deliquescent on exposure to the air. Soluble in 0.36 

 part of water and in 1.9 parts of alcohol. 



Dose. — Same as bicarbonate. ' 



PoTASSii CiTEAS. Potassium Citrate. KsCeHjO, 



(U. S. & B. P.) 

 Synonym. — Citrate de potasse, Fr.; Citronsaures kali, G. 

 Derivation. — Neutralize potassium carbonate with a 

 solution of citric acid, and evaporate to dryness. 

 3K,C03+ 2 HeCH^O, = 2K30,H,O, + 3H,0 + 3C0,. 

 Properties. — Transparent, prismatic crystals, or a white, 

 granular powder ; odorless and having a cooling, saline 



Digitized by Microsoft® 



