uncch102L_exp14

uncch102L_exp14 - Experiment 14 Determination of an...

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Experiment 14 – Determination of an Equilibrium Constant Summer 2010 I HAVE USED THIS LAB! IF YOU USE MY LABE VERBATUM, YOU WILL BE CAUGHT! Point Summary (See Blackboard for detailed grading rubric) Superior Excellent Satisfactory Fair Poor Omitted Introduction •Purpose of Report •Goals of Experiment Materials and Methods Results and Discussion •Description of data •Data Tables •Data Table Titles •Graphs •Figure Captions •Sample Calculations •Systematic Error •Random Error •Discussion of discrepancies Other Lab Technique TOTAL POINTS TA Comments/Suggestions:
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C HEMISTRY 102L R EPORT T EMPLATE EXPT. Determination of an Equilibrium Constant 14 14 Introduction The purpose of the report is to demonstrate understanding of the concept of equilibrium and present data in a clear, concise manner. The purpose of the experiment was to use known concentrations of solutions in conjunction with a standard curve and Beer’s Law to determine an equilibrium constant for a reaction. Materials and Methods The procedure for this experiment was taken from “Experiment 14: The Determination of an Equilibrium Constant in an Aqueous Solution” found in the Fall 2010 UNC-CH CHEM-102L Lab Manual . In deviation with the lab manual, to obtain a standard curve with a linear regression line with an r value between 1.00-0.998, the points were chosen from two trials instead of obtained in one trial. All other instructions were followed precisely. Results and Discussion When preparing the stock solutions of iron (III) nitrate nonahydrate and sodium thiocyanate, a small amount of each substance was weighed and placed in a separate 100-mL volumetric flask. Each flask was then filled to the mark with 0.1 M nitric acid (HNO 3 ). The mass of the iron (III) nitrate nonahydrate and sodium thiocyanate was used to determine the concentration, both found in data Table 1. Table 1. Stock Solution Masses and Concentrations
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This note was uploaded on 05/15/2011 for the course CHEM 102L taught by Professor N/a during the Fall '07 term at UNC.

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uncch102L_exp14 - Experiment 14 Determination of an...

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