Stoichiometry Lab Report

Stoichiometry Lab Report - Stoichiometry Chemical Reactions...

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Stoichiometry: Chemical Reactions of Copper and Percent Yield
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II. Purpose The purpose of this experiment was to demonstrate and test our laboratory skills by performing various tasks of stoichiometry. III. Procedure First, a piece of copper wire weighing approximately 0.1g was taken. Our T.A. demonstrated to us in the hood 1ml of concentrated nitric acid added to the copper, causing it to disintegrate. 100ml of distilled water was then added. Next, 30ml of 3.0M NaOH (sodium hydroxide) was stirred in, neutralizing the nitric acid and creating Cu(OH) 2 , or copper hydroxide. The solution at this point is blue in color. The copper hydroxide was then placed on a ring stand over a Meeker burner. Two small boiling stones were added as well. The solution was heated to just about boiling. A black precipitate of copper (II) oxide, CuO, was formed and allowed to settle. The liquid was decanted into the sink, leaving the copper (II) oxide behind. 100ml of very hot distilled water was added to the precipitate and allowed to settle, then that was decanted as well.
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