Determination of pKa- Effects of Substituents on Acidity - Determination of pKa Effects of Substituents on Acidity Final Lab Report By Sam Zike Gabe

Determination of pKa- Effects of Substituents on Acidity -...

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Determination of pKa: Effects of Substituents on Acidity Final Lab Report By Sam Zike Gabe Jones and Dom Bozeh Lab: Thursday 2:50-5:40 PM 2175 CHM 25601-009 Date: March 30 th , 2017 Due Date: March 30 th , 2017
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Purpose of the Experiment: The purpose of this experiment is to determine the pKa of a series of para-substituted benzoic acids to understand how the substituents affect the ionization of the acids. Chemical Structures/Reactions:
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Calculations: C D E F G H I V pH V I pH/ V V II ( pH/ V) ( pH/ V)V II 2.03 0.16 1.02 0.0788 2.015 -0.0179 -0.01 Results and Discussion: Results Successful calibration 20mg of 4-dimethyl aminobenzoic acid 5.16 was the start pH of the solution 0.5 mL addition at 15 second intervals 23- 0.5 mL addition in the fast run 16- additions in slow run slow run was expedited to get to critical drop period faster solution was clear 6mL + (7.2ml-0 x 0.2mL) = 6.105 mL pKa = 4.10 (13.6567) Discussion 1. The quick run provided a broad parameter of where the spike in pH would occur, it was not as accurate as the slow run as larger amounts were added.
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