Lab 3 - Petras1 Lab 3 Stoichiometry and Green Chemistry...

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Petras1 Lab 3: Stoichiometry and Green Chemistry Kaelyn Petras LBS171L Sec 008 TA: Merideth Fitzpatrick October 11 th , 2006
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Petras2 I. Title :  Green Chemistry II. Purpose :  The purpose of this lab was to determine the mass ratio of a  mixture of sodium bicarbonate and sodium carbonate.    III. Procedure :  Materials were gathered before the experiment could take  place.  Materials included:  two crucibles, crucible tongs, a Bunsen  burner, wire gauze, an analytical balance, ring stand, and the vile  which included the mixture.  The crucibles were washed and heated  with the Bunsen burner to remove excess liquid.  They were then  weighed to a constant weight.  4 grams of the solution was added to  each crucible and weighed using the balance.  Both crucibles were  placed on the wire gauze and heated gently using the Bunsen burner  for five minutes, in order to avoid sputtering.  The Bunsen burner was  turned up and more heat was introduced to the crucibles.  This  continued for five minutes when at that time, the crucibles were  removed from heat and allowed to cool.  After being cooled, the  crucibles were weighed on the analytical balance.  This procedure was  repeated until a constant weight was found. IV. Results :  Sample #153 Crucible 1 w/o Solution 11.591 grams Crucible 1 with Solution 15.182 grams Crucible 2 w/o Solution 12.533 grams Crucible 2 with Solution 16.133 grams
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Petras3 These crucibles were then heated.  The application of heat caused carbon  dioxide and water to be released.  The mass of the heated solution is therefore  less than the original mass.  The heating and cooling process was repeated  twice, as seen in the results. Trial 1: Crucible 1- 1 st  Heating 14.522 grams Trial 1: Crucible 1- 2 nd  Heating 14.523 grams Trial 2: Crucible 2- 1 st  Heating 15.480 grams Trial 2: Crucible 2- 2 nd  Heating 15.479 grams The results above include the weight of the crucible as well as the solution.  In  the provided sample lab report, the solution in grams without the crucible is  recorded. Solution- Crucible 1
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Lab 3 - Petras1 Lab 3 Stoichiometry and Green Chemistry...

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