416 SMITH'S INTERMEDIATE CHEMISTRY 



amount of water, in equilibrium with the same two solids, con- 

 tains 20 g. Nad and 40 g. KC1. On the basis of these figures, 

 devise a method for separating KC1 from Nad in the Alsace 

 deposits. 



4. The use of ammonium sulphate as a fertilizer is apt to 

 result in an add soil. Explain why. 



5. What are the three elements most needed in fertilizers? 

 Of which does every country have a free and unlimited supply? 

 How can it be made available? 



6. What valuable soil ingredients are lost to a locality when a 

 carload of wheat is shipped away? A carload of pure sugar? 

 Of cotton, (a) ginned or (b) unginned? Of peanut oil? 



