PART III 

 MURIATE OF POTASH 



Procedure. — Put the two filtrates contain- 

 ing the artificial carnalUt brine together and 

 evaporate the water until the hollow octahe- 

 dral crystals of potassium chlorid appear in 

 abundance. The decomposition of the car- 

 nalht yields some potassium chlorid which 

 crystalhzes out first; this is rapidly followd 

 by the clear dense crystals of the carnallit 

 itself. The latter may compose the major 

 portion of the precipitate. If too much or 

 nearly all the water is evaporated off mag- 

 nesium chlorid will separate out making the 

 product dehquescent. The crystals may be 

 separated from the magnesium chlorid brine 

 by the use of the Witt plate. The filtrate 

 containing the solution of magnesium chlorid 

 may be thrown away. 



The two salts, sulfate of potash and muri- 

 ate of potash, dried and weighd, are handed 

 in separately. 



NOTES 



The amount of water used to dissolv 

 the salts may be quite a little more than 

 would be calculated from the solubility 



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