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exp04 - Stoichiometry Laboratory Experiment#4 xxxxx Section...

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Stoichiometry Laboratory Experiment #4 xxxxx 10/12/2006 Section x
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Purpose The purpose of this lab was to find the percent mass composition of copper and chloride in the copper chloride compound. The molecular and empirical formulas for the reaction with the copper chloride compound also had to be found. Experimental Methods To begin the experiment the crucible had to be thoroughly cleaned so that no excess material could add weight or substance to the reaction. This was done by washing it out and then heating it up until completely dry. The crucible was then allowed to cool. Once cool, the crucible was massed using the electronic scale. This was done three times and averaged. A bit over 25 ml of the cupper chloride solution was then poured into the 250 ml beaker. Using this solution, the volumetric pipette was filled exactly to the 25 ml line and put into the crucible. Next, a piece of zinc metal was cleaned using steel wool. The zinc had to be cleaned enough to have a shiny silver color. The black residue had to be removed. After cleaning it, the zinc was put into the crucible, completely submerged in the copper chloride solution. The solid copper that was forming on the zinc needed to be constantly scraped off with the popsicle stick. This was done until the reaction was completely over. The end of reaction was signaled by the color of the solution. When the solution lost its blue color and turned clear, 10 drops of 1 M HCl were added. The piece of zinc was then washed off and weighed. The reaction mixture in the crucible was then decanted so that the solid copper could be isolated. In order to ensure that only copper
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