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Chemical Equilibrium chem 118 - Chemical Equilibrium David...

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Chemical Equilibrium David Mulkey 2/08/2011 Chemistry 118 Section M3 Group members: Stephan Real and Justin Pollock
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1. Ammonium chloride (NH 4 Cl) increases shelf life. It is stable under ordinary conditions for use and storage. It is not considered a fire hazard, but at fire temperatures ammonium chloride begins to corrode metals and may dissociate into ammonia and hydrogen chloride. Therefore, ammonium chloride can be used as a stabilizing agent to increase the new hair products shelf life. Equilibrium equation: NH 4 Cl ↔NH 3 + HCl (ammonium chloride dissociates into ammonia (NH 3 ) and hydrogen chloride (HCl) 2. For the experiment, the color of the iron (III) [Fe 3+ ] solution was to be observed. A stock Fe 3+ solution was made by adding .2 M (molarity) FeCl 3 aqueous (aq) to ten milliliters of water in a test tube. Twenty drops of this solution was added to five different wells on a well plate. Each well plate was mixed with ten drops of one of the following five solutions: .2 M iron (III) nitrate [Fe(NO 3 ) 3 ], sodium chloride (NaCl), Potassium thiocyanate (KSCN), saturated sodium fluoride (NaF), and tetrapotassium iron(II) hexacyanide (K 4 [Fe(CN) 6 ]).When Fe(NO 3 ) 3 was added to the stock solution the solution changed from a pale light yellow to a darker yellow which means there was an increase in the concentration of Fe 3+ with the chemical equation being: FeCl 3 + [Fe(NO 3 ) 3 ] ↔ FeCl 3 + [Fe(NO 3
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