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The Gravimetric Experiment (lab 2) - Eldridge...

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   Eldridge The Gravimetric Determination of  Chloride in Soluble Samples Joel I. Eldridge Abstract The purpose of this experiment is to determine the chlorine ion concentration of  an   unknown analyte.  Analyte is simply a chemical substance that is determined  from analytical methods.  The method used to carry out the experiment is the  gravitational method of analysis.  Gravitational method is a very precise  procedure when it is done properly.         
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   Eldridge Introduction Analyte is a chemical substance that is determined from analytical methods.  Today, a plethora of analytical methods are attainable in literature, each having  unique   advantages  and   disadvantages.     A   common   method   for  determining  chloride   ions   involves   isolating   the   silver   chloride   precipitate   via   filtration,  determining its mass, and using stoichiometry to calculate the percent chloride in  a sample. This process is best known as gravimetric analysis, which is a method  of quantitative chemical analysis in which the key constituent being sought after  is converted to a substance that can be separated from the remaining sample. For the experiment you will obtain an unknown sample, containing chloride ion, and you  will   perform   the   gravimetrical   procedure   using   the   sample.   The   challenge   of   the  experiment is to prove if there is any significant difference in order to show which  value is the most accurate estimate of the true percentage value of chloride in a  given sample.    Requirements for this lab included good comprehension skills, lab  techniques,   statistical   tests,   and   replicas   of   trials   in   order   to   improve   the  confidence value.   Principle
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   Eldridge When a silver ion solution, usually silver nitrate (AgNO 3(aq)  ), is added to a  dissolved sample that contains the chloride ion, it will result in the precipitation of  the chloride as a solid silver chloride (AgCl).  The precipitate that is formed is  usually separated from the solution by way of filtration, dried, and weighed.  Once  the isolation process is complete the percent chloride is then calculated from the  stoichiometry of the reaction:                                      AgNO 3(aq)  + NaCl (aq)         AgCl (s)  + NaNO 3(aq)              Experimental Reagents to be prepared by stockroom staff:   Chloride unknown, predried for 24 hours at 110 ° 6 M HNO Concentrated HNO 3
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   Eldridge 6 M NH 0.2 M AgNO NaCl    Materials  
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