Experiment 34- Equilibrium Constant Results Only Lab Report.docx

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Experiment 34: Equilibrium Constant Adriana Cerbo Cassandra Ross Chemistry 1310 Dr. Maria Ballester LA Mamiko Swanson 17 February 2021 Abstract The purpose of this experiment was to use a spectrophotometer to determine the equilibrium constant of a chemical system, to using graphing techniques and data analysis to evaluate data, and then to determine the equilibrium constant for a soluble equilibrium. The method used for this experiment was the spectrophotometric method which involves the interaction of electromagnetic radiation with matter. This method required the use of a spectrophotometer which allowed us to measure the transmitted light with a photosensitive detector at visible wavelengths. The wavelength at which the molecules had the most absorption of radiation was then used as the set wavelength for the analysis. At the conclusion of this experiment, the average equilibrium constant (145.272), the standard deviation (36.852), and the percent relative standard deviation (25.367%) were determined.
Data & Results Table 1: A Set of Standard Solution to Establish a Standardization Curve A. A Set of Standard Solution to Establish a Standardization Curve Molar concentration of Fe(NO3)3 0.2 0.2 0.2 0.2 0.2 0.2 Molar concentration of NaSCN 0.001 0.001 0.001 0.001 0.001 0.001 Standard Solutions Blan k 1 2 3 4 5 A.1. Volume of NaSCN (mL) 0 1 2 3 4 5 A.2. Moles of SCN- (mol) 0.00000 1 0.00000 2 0.00000 3 0.00000 4 0.00000 5 A.3. [SCN-] (25.0 mL) 0.00004 0.00008 0.00012 0.00016 0.0002 A.4. [FeNCS2+] (mol/L) 0.00004 0.00008 0.00012 0.00016

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