CHEM 112 Experiment 34 .docx - Juliana Lopez 24 September...

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Juliana Lopez 24 September 2020 Experiment 34: An Equilibrium Constant
Abstract: The reason for this lab was to find the equilibrium constant for the formation of a complex ion using a spectrophotometer. Then, graphing techniques will be used to evaluate the data. This would help in finding the equilibrium constant for a soluble equilibrium. There were three parts to this experiment. The first part was to set up a calibration curve from a set of standard solutions. The second part was to discover the absorbance of the test solutions. The last part was to calculate the K c . The techniques used were cleaning the glassware, preparing solutions, properly discarding chemical waste, reading and recording, and lastly using a pipet. A spectrophotometric is a measuring instrument that measures transmitted light intensities of a source in different visible wavelengths. Some possible errors were not properly cleaned glassware, fingerprints outside the cuvette, inaccurate measurements, spectrophotometer not working, and inaccurate readings. The results were average equilibrium constant, the standard deviation, and the percent relative standard deviation. Introduction: The goal for this lab is determining the equilibrium constant for the formation of a

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