Lab Report 02 Five White Powders

Lab Report 02 Five White Powders - Scientific Observations...

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Scientific Observations and Reaction Stoichiometry: The Qualitative Analysis and Chemical Reactivity of Five White  Powders Jabiz Behzadpour Lab Section 414 7:30 AM Thursday Mekala Pansalawatta 9/13/2007
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Introduction:  There are many types of reactions that occur in chemistry, and the one we are studying  in this lab is a double displacement reaction.  When equal masses of Na 2 Co 3  and CuCl 2  are  reacted, a solid precipitate of CuCO 3  is formed.  After weighing the precipitate, it is possible to  come up with the limiting reagent, theoretical yield, and percent yield of this experiment.  This  lab will concern weighing 1.0000 g of Na 2 CO 3  and reacting it with 1.0000 g of CuCO 3  to observe  its reaction. All chemical substances have various properties that are unique to themselves.  Some  examples are solubility, pH, and chemical reactivity.  These differences enable scientists to  distinguish compounds from one each other and name them accordingly.  The five compounds  BaCO 3 , BaCl 2 , BaSO 4 , Na 2 CO 3 , and NaCl all react differently in the above situations, and their  different reactions reveal a lot about their chemical properties. Experiment: Required Equipment Na 2 CO 3 CuCl 2 Vacuum filtration  apparatus Filter paper BaCO 3 BaCl 2 BaSO 4 Na 2 CO 3 NaCl 3M HNO 3 0.1 M Na 2 SO 4 0.1 M AgNO 3 Universal indicator solution Measure 1 g of Na 2 CO 3  and 1 g of CuCl 2 .  Place them in separate beakers, and add 25  mL of water to each beaker.  Stir the solutions until they are fully dissolved, then slowly add the  CuCl 2  liquid to the Na 2 CO 3  beaker.  After making sure all the liquid is transferred, rinse the CuCl beaker with distilled water and add that to the other beaker.  Assemble a vacuum filtration  apparatus to separate the precipitate (CuCO 3 ) from the liquid.  Add moistened filter paper on the  vacuum apparatus and pour CuCl 2  down the vacuum slowly making sure no liquid gets above  the filter paper line.  Wait for the precipitate to dry, and then weigh the filter paper and  precipitate to determine its mass.  From this you can calculate actual yield, theoretical yield, and  percent yield. Obtain small amounts of BaCO 3 , BaCl 2 , BaSO 4 , Na 2 CO 3 , and NaCl and put them each in  separate beakers.  Add water to determine the solubility of each compound (record  observations), and then add Universal Indicator to determine the pH of each solution (record  observations).  After that add HNO to each solution until it turns acidic.  Record your  observations, if any reaction occurred or not.  Now divide all the solutions in half and put the 
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