37 



prisms, tasting like common salt. Solubility, 1 in 2 of 

 water. 



Impurities. Acid tartrate of potash. 



Dose. i to ^ oz. 



/. Sodse Sulphas. Sulphate of Soda. Glauber's 

 salj. Na^SO^lOHaO. 



"~ Source. Prepared by adding Carbonate of Soda to| 

 the acid sulphate left in the manufacture of hydrochloric* 

 acid. Na 2 C0 3 + 2NaHS0 4 = 2NasS0 4 + C0 2 + H 2 0. 



Characters. Colourless transparent oblique rhom- 

 bic prisms, efflorescent, with a bitter salt taste. 1 part 

 soluble in 3 of Water. 



Impurities. Salts of ammonium and iron. 



Dose. ^ to 1 oz. > 



g. Soda Phosphas. Phosphate of Soda. NaJIP0 4 . 

 ~~ 



Source. Prepared by adding a solution of Carbonate 

 of Soda to the acid product of the action of sulphuric 

 acid on bone-ash, and crystallising. (1) Ca 3 2P0 4 -f 

 2H 2 S0 4 = CaH 4 2P0 4 + 2CaS0 4 . (2) CaH 4 2P0 4 -f 

 Na.,CO3 = Na 2 HP0 4 + CaHP0 4 + H 2 + C0 2 . 



Characters. Colourless transparent rhombic prisms, 

 efflorescent, tasting like common salt. 1 part soluble in 

 5 of water. Used to make ferri phosphas and syrupus 

 ferri phosphatis. 



Impurity. Phosphate of lime. 



Dose. _tp_l_qz. ^ 



h. SodsB Hvpophosphis. H^T>ophosphite of Soda. 

 NaPH 2 2 . 



Source. Prepared by adding Carbonate of Soda to a 

 solution of Hypophosphite of Lime, and evaporating the 

 solution. Ca2PH 2 2 + Na^COg = 2NaPH 2 2 + CaC0 3 . 



Characters. A" white granular deliquescent salt, 

 with a bitter nauseous taste. 1 part soluble in 2 of 

 water. 



Dose. 5 to 10 gr. 



i. Sodaa ^r^fipiaq. Arseniate of Soda. Na.,HAs(X. 

 7H 2 0. 



Source. Prepared by fusing Carbonate of Soda and 

 Nitrate of Soda with Arsenious Acid, dissolving out and 

 crystallising. 



Characters. Colourless transparent prisms. 1 part 

 soluble in 2 of water. 

 to i gr. 



