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LabReport6 - Hyun Woo Sung Chem 112 Laboratory Lab Report#6...

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Hyun Woo Sung Chem 112 Laboratory Lab Report #6 Introduction: The purpose of this lab was to titrate two different carbonated drinks, which were sprite and cola, with sodium hydroxide, and use the data to create a titration curve graph. Using the graph, the acid dissociation constant of each acid can then be determined by using the equivalence point, which is the point on the graph where the pH increases sharply. Since each equivalence point from the polyprotic acids are all proportional in terms of the volume of base added, half of that volume from one equivalence point to another will inevitably lead to the half equivalence point, where the pH equals the pKa. Using the amount of base added along with the molarity of the base, the concentration of either citric or phosphoric acid can be derived. Report: Citric Acid (Sprite) Phosphoric Acid (Coke) mL of 0.02M NaOH pH mL of 0.02 M NaOH pH
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0 0.5 1.1 1.4 1.7 2.1 2.4 2.8 3.1 3.5 3.7 4.1 4.4 4.6 4.9 5.2 5.5 5.7 6 6.2 6.6 6.9 7.1 7.2 7.4 7.5 7.6 7.65 7.7 7.8 7.825 7.85 7.875 7.9 7.95 7.975 8.1 8.15 8.25 8.3 8.5 8.7 9.2 9.7 2.73 2.93 3.13 3.33 3.53 3.73 3.93 4.13 4.33 4.53 4.73 4.93 5.13 5.33 5.53 5.73 5.93 6.13 6.33 6.53 6.73
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