Experiment 20.docx - Experiment 20 pH Titration of Cola Drinks October 27th 2017 CHEM 1212K Section B05 TA Iramofu Dominic Honor Pledge Freshman

Experiment 20.docx - Experiment 20 pH Titration of Cola...

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Experiment 20 pH Titration of Cola Drinks October 27th, 2017 CHEM 1212K Section B05 TA: Iramofu Dominic Honor Pledge – Freshman Chemistry Laboratories I did not copy any portion of this work from the work of other students, old lab reports, or unreferenced materials. I understand that such activity is a violation of the Georgia Tech Honor Code. ______________________________________ Signature Data and Results
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A. Standardization of NaOH Table 1. Standardization of NaOH Trial Mass KHP (g) Volume NaOH Solution (mL) [NaOH] (mol/L) 1 0.065 31.00 0.010278 2 0.067 33.50 0.009804 Mean [NaOH] (mol/L) 0.010041 B. Titration of Cola Sample Table 2. Initial Parameters of Titration Volume of Cola (mL) 20 Initial pH 2.31 Table 3. Data for Titration of Cola Volume of titrant (mL) pH DpH DV (ml) DpH/DV Avg. V of titrant (mL) 0.00 2.31 0.04 1.00 0.04 1.00 2.35 0.05 1.00 0.05 0.50 2.00 2.40 0.05 1.00 0.05 1.50 3.00 2.45 0.05 1.00 0.05 2.50 4.00 2.50 0.05 1.00 0.05 3.50 5.00 2.55 0.08 1.00 0.08 4.50 6.00 2.63 0.08 1.00 0.08 5.50 7.00 2.71 0.10 1.00 0.10 6.50 8.00 2.81 0.07 1.00 0.07 7.50 9.00 2.88 0.71 3.00 0.24 8.50 12.00 3.59 0.46 1.00 0.46 10.50 13.00 4.05 0.68 1.00 0.68 12.50 14.00 4.73 0.64 1.00 0.64 13.50 15.00 5.37 0.50 1.00 0.50 14.50 16.00 5.87 0.30 1.00 0.30 15.50 17.00 6.17 0.08 1.00 0.08 16.50 18.00 6.25 0.09 1.00 0.09 17.50 19.00 6.34 0.12 1.00 0.12 18.50 20.00 6.46 0.06 0.50 0.12 19.50 20.50 6.52 0.14 1.00 0.14 20.25 21.50 6.66 0.03 0.50 0.06 21.00 22.00 6.69 0.05 0.50 0.10 21.75 22.50 6.74 0.14 1.00 0.14 22.25 23.50 6.88 0.09 0.50 0.18 23.00 24.00 6.97 0.04 1.00 0.04 23.75 25.00 7.01 0.04 1.00 0.04 24.50 26.00 7.05 0.16 1.00 0.16 25.50 27.00 7.21 0.06 0.50 0.12 26.50 27.50 7.27 0.04 1.00 0.04 27.25 28.50 7.31 0.12 0.50 0.24 28.00 29.00 7.43 0.12 0.50 0.24 28.75 29.50 7.55 0.07 0.50 0.14 29.25
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30.00 7.62 0.16 0.50 0.32 29.75 30.50 7.78 0.15 1.00 0.15 30.25 31.50 7.93 0.11 0.50 0.22 31.00 32.00 8.04 0.08 0.50 0.16 31.75 32.50 8.12 0.21 0.50 0.42 32.25 33.00 8.33 0.17 0.50 0.34 32.75 33.50 8.50 0.18 0.50 0.36 33.25 34.00 8.68 0.30 1.00 0.30 33.75 35.00 8.98 0.12 0.50 0.24 34.50 35.50 9.10 0.14 0.50 0.28 35.25 36.00 9.24 0.06 0.50 0.12 35.75 36.50 9.30 0.14 1.00 0.14 36.25 37.50 9.44 0.08 0.50 0.16 37.00 38.00 9.52 0.07 1.00 0.07 37.75 39.00 9.59 0.04 0.50 0.08 38.50 39.50 9.63 0.06 1.00 0.06 39.25 40.50 9.69 0.05 2.00 0.03 40.00 42.50 9.74 0.04 1.00 0.04 41.50 43.50 9.78 0.07 2.00 0.04 43.00 45.50 9.85 0.07 1.00 0.07 44.50 46.50 9.92 0.00 0.00 0.00 46.00 [H 3 PO 4 ] in Original Cola Sample (mol/L) 1.60E-02 Plot 1: Titration Curve with Approximate First Derivative 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 Average Volume of Titrant (ml) pH Delta pH/Delta V Table 4. Determination of K a Values K Graphical Analysis Literature Values V 1/2 (mL) p K a K a p K a K a K a1 6.25 2.63 2.34E-03 2.15 7.08E-03
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K a2 16.125 5.87 1.35E-06 7.2 6.31E-08 p K a1
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