Lab 15 report

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Chemistry

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Jan 9, 2024

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Gurkaran Singh Tomoko Hagane-Mullins May 1, 2022 Lab 15: Titration Curves “Drop the base” Part 1: A Mysterious Acid Titration Data Table: Volume of 0.200 M NaOH, mL First derivative pH 0 0.39 2.42 1 0.27 2.81 2 0.2 3.08 3 0.12 3.28 4 0.1 3.4 5 0.08 3.5 6 0.09 3.58 7 0.07 3.67 8 0.07 3.74 9 0.08 3.81 10 0.06 3.89 11 0.07 3.95 12 0.07 4.02 13 0.06 4.09 14 0.05 4.15 15 0.06 4.2 16 0.07 4.26 17 0.06 4.33 18 0.06 4.39 19 0.06 4.45 20 0.05 4.51 21 0.06 4.56 22 0.05 4.62
23 0.05 4.67 24 0.09 4.72 25 0.14 4.81 26 0.16 4.95 27 0.26 5.11 28 0.17 5.37 29 0.3 5.54 29.5 0.44 5.69 30 0.76 5.91 30.25 1.56 6.1 30.5 8.12 6.49 30.75 9.92 8.52 31 0.65 11 32 0.28 11.65 33 0.26 11.93 34 0.1 12.19 35 0.12 12.29 36 0.02 12.41 37 0.01 12.43 38 0.02 12.44 39 0.02 12.46 40 0.02 12.48 41 0.01 12.5 42 0.02 12.51 43 0.01 12.53 44 0.02 12.54 45 0.01 12.56 46 0.01 12.57 47 0.01 12.58 48 0.02 12.59 49 0.01 12.61
50 0.2524 12.62 Buffer Region= pK a ± 1=4.2 ± 1=3.2 to 5.2 Buffer Region= pH=3.2 to 5.2 Equivalence Point: pH = 8.52, 30.75 moles NaOH Midpoint: 30.75 mL/2 =15.38 pH = 4.2, 15.38 mL moles NaOH pH=pKa →Ka=10^−pH pH=10^−4.2=6.31 x 10^-5
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