Chem Exp. Rep. 1

Chem Exp. Rep. 1 - 02/10/08 CHEM 202 Experiment Report:...

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02/10/08 CHEM 202 Experiment Report: Determining the Equivalent Mass and Dissociation Constant of an Unknown Acid by Titrimetry PURPOSE: The purpose of this lab was to measure the pKa of an unknown acid using titrimetry by graphing volume and pH then finding the equivalence point and half-equivalence point of the graph. RESULTS AND DATA: Deter. 1 Deter. 2 Volume of NaOH soln required to reach equivalence point, mL 13.6 10.1 # Equivalence of NaOH req. to reach equivalence point .00386 .00287 # Equivalents of unknown acid titrated, equiv. .00386 .00287 Equivalent mass of unknown acid, g/equiv. 78.1 107 Avg. Equivalent mass of unknown acid, g/ equiv. 92.3 pKa of unknown acid 6.80 5.05 Avg. pKa of unknown acid 5.93 Ka of unknown acid 1.58E-7 8.91E-6 Avg. Ka of unknown acid 4.53E-6 Name of unknown acid Butyric Acid Reported pKa of acid named above 4.83 Calculated Ka of acid named above 1.48E-5 CALCULATIONS:
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POST-LAB QUESTIONS: 1.) a.) % Error= 4.76 % b.) % Error=20.2 % 2.) a.) Calculated molarity would be too high because it would lead to a higher amount of
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This lab report was uploaded on 04/08/2008 for the course CHEM 202 taught by Professor Cummings during the Spring '08 term at Nevada.

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Chem Exp. Rep. 1 - 02/10/08 CHEM 202 Experiment Report:...

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