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An Equilibrium Constant Chem 1112- 02 24/02/2020 Yashawn Hamilton Vanessa
Objective The experiment performed was meant to determine the equilibrium constant of a chemical system by using a spectrophotometer. Once data was obtained graphing techniques are used to analyze the data and figure out the equilibrium constant for a soluble equilibrium. Introduction The experiment was completed to determine the equilibrium constant of a chemical reaction using Fe 3+ (aq) and SCN - (aq). This chemical reaction created a state of chemical equilibrium. The equilibrium state can be categorized by stating its equilibrium constant as large, greater than one, or small, less than one, but not negative or zero. A large Kc (equilibrium constant) means that at equilibrium, the concentrations of the products will generally be greater than the concentrations of the reactants, meaning it is products favored. A small Kc means that at equilibrium, the concentrations of the reactants will generally be greater than the concentrations of the products, meaning it is reactants favored. The relevant chemical equation for this lab is: Fe 3+ (aq) + SCN - (aq) FeSCN 2+ (aq). Once the equilibrium concentration of FeSCN 2+ (aq) was determined, the equilibrium concentrations of the reactants (Fe 3+ (aq) and SCN - (aq) can be calculated. Procedure The spectrophotometer was turned prior to the preparing of the solutions so that it had time to become warm. A set of standards of solutions was created in the experiment. Six 25 mL
volumetric flasks were first rinsed and dried to ensure that there was no residue, from previous experiments. The volumetric flasks were then labeled blank and 1-5 so that the order would not be confused. 0.1M Na was added to each volumetric flask. A plastic graduated cylinder was used to measure this solution. It was not cleaned after every used of the same liquid. The solution was poured carefully and slowly into the volumetric 0ask to ensure that none of it was spilled. Then 10 mL of 0.2 M of Fe(NO 3 ) 3 was added to each volumetric flask. Using the same

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