POTASSIL'M. 31 



Characters. A white gritty powder, or fragments of < 

 of a pleasant acid taste ; not deliquescent. Soluble in 200 parts 

 of cold water. 



Dose. 20 to 60 gr. as a diuretic and refrigerant ; 2 to 81 

 dr. as a purgative. 



Acid Tartrate of Potash is an important ingredient of : 



^Confectio Sulphuris (1 in 9) ; and^Pulvis Jalapael 

 Compositus (9 in 15). It is also used in preparing! 

 various other drugs. 



from this salt is derived : 



Potassse Tartras. Tartrate of Potash. K 2 C 4 H 4 O r 



Source. Made by adding Acid Tartrate of Potash] 

 to a solution of Carbonate of Potash, and crystallising. I 

 2KHC 4 H 4 6 + K 2 C0 3 = 2K 2 C 4 H 4 6 + C0 2 + H 2 0. 



Characters. Small colourless deliquescent prisms. 

 10 parts are dissolved in 8 parts of water. 



Impurities. Acid tartrate; detected by insolubility. 

 Carbonates ; by quantitative test. 



Dose. 20 to 60 gr. as a diuretic and antacid ; 2 to | 

 4 dr. as a purgative. 



3. Potassae IVitras. Nitrate of Potash, N 

 Saltpetre^ KN0 3 . 



>'ce. Found native, and purified by crystallisation, m 



Characters. Striated colourless prisms, of a peculiar saline 

 taste. Solubility, 1 in 4 of water. 



Dose. 10 to 30 gr. 



From Potassa Nitras is made : 



otassse Sulphas. Sulphate of Potash. E^SCv 

 ource. Prepared from Nitrate of Potash and Sul-V 

 phuric Acid, which yield the acid sulphate KN0 3 -{- 

 H 2 S0 4 = KHS0 4 + HN0 3 ; then addin- of 



Potash 2KHS0 4 + K 2 C0 3 = 2K 2 S0 4 + H,O + 



Characters. Colourless hard six - sided pi i 

 terminated by six-sided pyramids. Solubility, 1 in 10 

 of water; not soluble in spirit. 



Impurities. Other sulphates, and chlorides. 



Dose. 15 to tiu -r. 



Potassa Sulphas is contained in : 



Pulvis IpecacuanhaB Compositus. 8 in 10 ;j 

 Pilula Colocyiithidis Composite; and Pilula Colo- 1 

 cynthidis cum llyoscyamo. 



Po 



So 



