PER RUM. 73 



6. Ferri Carbonas Saccharata. 37 per cent, of 

 Carbonate of Iron, FeC0 3 , mixed with Peroxide of Iron 

 and Sugar. 



Source. Made by precipitating a solution of Sulphate 

 of Iron with Carbonate of Ammonia, and rubbing with 

 Sugar. (1) FeS0 4 + (NH 4 )CO 3 = FeC0 3 4- (NH 4 ) S0 4 . 

 (2) 3FeC0 3 + O = FeC0 3 -f Fe. 2 3 -f 200^ The sugar 

 prevents oxydation. 



Characters. Grey -brown lumps, with a sweet chaly- 

 beate taste. 



Impurities. Sulphate of ammonia and oxide of iron. 



Dose. 54;o 20 gr. 



Preparation. 



Pilula Ferri Carbonatis. 1 to 1 of Confectio 

 Rosse. 



Dose. 5 to 10 gr. 



^ e. Mistura Ferri Composita. " Griffiths' Mixture." 

 Sulphate of Iron, 25 gr. ; Carbonate of Potash, 30 gr. ; 

 Myrrh, 60 gr. ; Sugar, 60 gr. ; Spirit of Nutmeg, 4 fl.dr. ; 

 Rose Water, 9 fl.oz. Dose, 1 to 2 fl.oz. 



d. Ferri Arsenias. Arseniate of Iron. Fe 3 As 2 8 . 



Source. Made by precipitating a mixed solution of 

 Arseniate and Acetate of Soda with Sulphate of Iron; 

 and washing. 3FeS0 4 -f 2Na2As0 4 + 2NaC 2 H 3 O a = 

 FegAsjjOg + SNasSC^ + 2C 2 H 4 O 2 . 



Characters. A green amorphous powder, tasteless 

 (but not to be tasted), insoluble in water. 



Impurities. Sulphates, and general impurities. 



Dose. ^ to 2 gr. in pill. 



e. Ferri Phosphas. Phosphate of Iron. Fe^' 



Source. Made by precipitating a mixed solution 

 of Phosphate and Acetate of So<la with Snip!. 

 Iron. 3FeS0 4 + 2Na2HP0 4 + 2Nu< ' .11 ,>.. 

 3Xa.,S0 4 + 2C 2 H 4 O a . 



Characters. A slate-blue amorphous powder, in- 

 soluble in water. 



Impurity. Arsenic; detected by Reinsch'.- 



Dose. 5 to 10 gr. 



/. Ferri Persulphatis Liquor. 



Source. Made by boiling nitric acid and v 

 with a hot solution of sulpha!.' <>f ii"n in sulphur;"' 

 and water. eiFeSOJ + 3(H a S0 4 ) + 21INO, = 3(F. 



