Shepler-5168aa7782cf7Experiment 20 pH titration of cola-2 - I Cover Sheet Experiment 20 pH Titration Phosphoric Acid in Cola Drinks Megan Guenther

Shepler-5168aa7782cf7Experiment 20 pH titration of cola-2 -...

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I.Cover SheetExperiment 20: pH Titration: Phosphoric Acid in Cola DrinksMegan GuentherFebruary 20, 2013Chemistry 1212K- A08TA: Aaron McKeeLab Partners: Zola Zalesky, Willem Schuttler, Andrew HuangHonor Pledge: “I did not copy this work from any other student(s), currentin lab or old lab reports”X_______________________________
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II.Data/ ResultsPart A: Standardization of NaOH Table 1: NaOH StandardizationTrial 1Trial 2Mass KHP (g)0.0670.068DI water (mL)20.320.4Drops phenophthalein55mL NaOH25.8 mL32.7 mLM NaOH0.01290.0100Part B: Analysis of Cola Sample Using TitrationExperimental Setup Table:Table 2: pH Titration DataVolume(mL)pHΔpHΔ volΔpH/ΔvolaveragevolumeVolume(mL)pHΔpHΔvolΔpH/Δvolaveragevolume02.430000167.090.070.50.1415.7512.510.0810.080.516.57.180.090.50.1816.2522.570.0610.061.5177.250.070.50.1416.7532.640.0710.072.517.57.350.10.50.217.2542.780.1410.143.5187.460.110.50.2217.7552.860.0810.084.518.57.60.140.50.2818.2563.030.1710.175.5197.710.110.50.2218.7573.280.2510.256.519.57.830.120.50.2419.257.53.430.150.50.37.25207.990.160.50.3219.7583.570.140.50.287.7520.58.170.180.50.3620.258.53.820.250.50.58.25218.40.230.50.4620.7594.270.450.50.98.7521.58.710.310.50.6221.259.55.020.750.51.59.25228.890.180.50.3621.75105.510.490.50.989.7522.59.070.180.50.3622.2510.55.860.350.50.710.25239.190.120.50.2422.75116.010.150.50.310.7523.59.330.140.50.2823.25126.320.3110.3111.5249.430.10.50.223.7512.56.480.160.50.3212.25259.580.1510.1524.5136.590.110.50.2212.75269.720.1410.1425.513.56.690.10.50.213.25279.820.110.126.5146.760.070.50.1413.75289.910.0910.0927.514.56.840.080.50.1614.25299.980.0710.0728.5156.910.070.50.1414.753010.050.0710.0729.5Volume of Cola Used20.0 mLInitial [H3O+]0.00372 M
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15.57.020.110.50.2215.25Table 3: KaDataGraphical (Visual) AnalysisComparison to Visual AnalysisVolumeused to findpKapKaKaLiteraturevalue, pKaLiteratureValue, KaKacalc’dfromintial pH1stEquilibriumConstant9.505.029.55e-62.127.1e-30.003722ndEquilibriumConstant21.008.43.98e-97.206.3e-8Sample Calculations:1.Molarity of NaOH Solution, Trial 1:(0.068g)(1mol204.2g)=3.33×104=mols KHPmols KHP=mols NaOH @equilivalance point3.33×104=mols NaOH3.33e-4mols0.0258L=0.0129M NaOH2.Concentration (M) of Phosphoric Acid in Cola Sample:mols NaOH at first equilibrium point=(0.0129M) (0.0095
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