lab 8z - Zachary Kmieciak Mr. Songpo Chemistry 112 8AM Wed...

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Zachary Kmieciak Mr. Songpo Chemistry 112 – 8AM Wed 6 November 2006 Some Examples of Chemical Equilibria – Le Chatlier’s Principle Introduction The purpose of this experiment is to observe a number of interesting and colorful chemical reactions that are examples of chemical systems at equilibrium. The purpose is also to see how these systems respond to changes in the concentrations of reactants or products or to changes in temperature. Procedure/Observations Part I (a) In the first part, we added 3-mL of 1M K 2 CrO 4 into a test tube, followed by several drops of 3 M H 2 SO 4 . This turned orange as it was mixed. Then several drops of 6 M NaOH was added and stirred, turning the solution yellow. The solution turned back to orange when a few drops of H 2 SO 4 were added again. (b) In the second part, a drop of methyl orange was added to 3-mL of water. 2 drops of 6 M HCl and 4 drops of 6 M NaOH followed this, turning the solution from light yellow to pink then back to light yellow. When phenolphthalein was used in substitution for the methyl orange the solution went from clear to clear to pink.
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(c) In the third part to two 3-mL samples of .1 M CH 3 HOOH was added a drop of methyl orange. To one sample was added a few drops of 1 M NaCH
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This note was uploaded on 04/02/2009 for the course CHEM 112 taught by Professor Jursich during the Spring '08 term at Ill. Chicago.

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lab 8z - Zachary Kmieciak Mr. Songpo Chemistry 112 8AM Wed...

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