POTASH SALTS 



PART I 

 SULFATE OF POTASH-MAGNESIA 



The sulfate of potash-magnesia is made 

 according to the equation, 



3KC1 + 2MgS04 • H2O + IIH2O = K2SO4 . 

 MgS04 • 6H2O + KCl . MgCl2 • 6H2O, 



by mixing saturated brines of potassium 

 chlorid and magnesium sulfate. 



Procedure. — Weigh out 60 grams of 

 muriate of potash and add it, as fast as it will 

 dissolv, to about 100 cc. of boiling water. 

 Makmg sure that all the salt is in solution 

 filter the mixture while hot through a Witt 

 plate to separate the iron oxid, dirt and sand. 

 Put the filtrate in a beaker, keep the liquid 

 at boiling temperature, and concentrate the 

 brine until crystals of potassium chlorid begin 

 to appea,r on the surface, showing that the 

 solution is saturated at that temperature. 



While the foregoing is in operation weigh 

 out 100 grams of kieserit and dissolv it in 

 about 75 cc. of boiling water, adding the 

 salt slowly. In case it does not all go into 

 solution, indicated by a residue of salt on the 



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