Muriate of Potash 37 



4. How much potash is there in a ton of kainit 

 containing 12 per cent KoO? 



'5. If potassium chlorid and magnesium sulfate 

 solutions are mixt what salt is most likely to be pre- 

 cipitated? Why? 



6. What is the solubility of four salts used in the 

 exercise? Express relatively at some definite tem- 

 perature, putting the most soluble at the head of the 

 colum. 



7. What materials, in addition to sodium chlorid, go 

 to make up the 20% impurities in ordinary muriate 

 of potash? 



8. How does the double sulfate of potash-magnesia 

 decompose upon being dissolvd in a small quantity 

 of water? 



9. What use is made industrially of the magnesium 

 chlorid brine that, in this exercise, is thrown away after 

 the high-grade muriate of potash has b3en filterd off? 



10. Deicribs the American sources of potash. 



