THE GRAVIMETRIC DETERMINATION OF CHLORIDE

THE GRAVIMETRIC DETERMINATION OF CHLORIDE - 2 3 ABSTRACT

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THE GRAVIMETRIC DETERMINATION OF CHLORIDE
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ABSTRACT The purpose of this laboratory experiment was to use precipitation of chloride as the silver salt  from a sample solution to approximate the amount of AgNO 3  needed by calculating the volume that would  be required if the unknown were twenty-five percent NaCl. The volumes observed were 32.4 mL, 33.8  mL, and 33.4 mL. This approximates about 0.0065 moles Ag.  INTRODUCTION There are several different ways to determine the chloride content of a material. The procedure in  this laboratory report is known as the “standard” as to which other methods are judged by. This method  requires precipitation of chloride as the silver salt from a sample solution. The reaction taking place is Ag + Cl -    AgCl (s).  This laboratory requires us to collect the precipitate in a weighed filtering crucible. It is then  washed, and dried to a constant mass at 110° C. During precipitation, the solution is kept slightly acidic to  prevent interference from anions of weak acids. (Prevent formation of soluble silver salts in a neutral  environment. An over-excess of silver ion is avoided to prevent co-precipitation of silver nitrate, but an 
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THE GRAVIMETRIC DETERMINATION OF CHLORIDE - 2 3 ABSTRACT

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