Mention a common impurity in Potassium Bitar- 

 trate. Tartrate of Calcium. 



What per cent, of Ferric Chloride does Liquor 

 Ferri Chloridi contain? 37.8 per cent. 



What per cent, of Ferric Nitrate does Liquor 

 Ferri Nitratis contain? 6 per cent. 



What per cent, of Subacetate of Lead does Liquor 

 Plumbi Subacetatis contain? 25 per cent. 



What officinal preparation is an antidote for arse- 

 nic? Ferri Oxidum Hydratum Cum Magnesia. 



Mention the composition of Gum Arabic. Arabin, 

 lime, potassa and magnesium. 



What is a Rhizome? A creeping stem or branch 

 growing beneath the surface of the soil, or partly 

 covered by it. 



What Soaps are officinal? Green Soap and Cas- 

 tile Soap. 



What change takes place when Sulphate of Iron 

 is exposed to the air? Oxysulphate of Iron is 

 formed by the absorption of oxygen. 



What salt of Iron is found when Iron is dissolved 

 in Hydrochloric Acid? Ferrous Chloride. 



How is Ferric Chloride made? By the addition 

 of Nitric Acid to solution of Ferrous Chloride. 



How would you powder Camphor? By the addi- 

 tion of a small quantity of alcohol while rubbing 

 in a mortar. 



What is solution? The permanent and complete 

 incorporation of a liquid, solid or a gaseous sub- 

 stance with a liquid. The product is called a solu- 

 tion, the liquid used, a solvent, and if the solvent 

 will dissolve no more of the substance, the product 

 is called a saturated solution. 



What is the difference between simple and chemi- 

 cal solution? In simple solution no change occurs 

 in the chemical structure of the dissolved substance 



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