lab7-disc - Experiment 7: pH Study of Phosphoric Acid in...

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Experiment 7: pH Study of Phosphoric Acid in Cola Drinks Name: Fletcher Dostie Experiment Performed: 2/23/09 Turned in: 3/2/09 “I commit to uphold the ideals of honor and integrity by refusing to betray the trust bestowed upon me as a member of the Georgia Tech community.”
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(1) The pH of the cola initially was 2.37, while at the first equivalence point it was 4.42. At the first equivalence point, H 2 PO 4 - was acting as an acid, because as additional NaOH was added past this point, H 2 PO 4 - lost electrons to become HPO 4 2- . As the cola was titrated to the first equivalence point, The phosphoric acid began to lose electrons, until at the first equivalence point, all the phosphoric acid had been converted to H 2 PO 4 - . As more base was added, the H 2 PO 4 - lost another electron, becoming HPO 4 2- . (2) The values of pK a1 and pK a2 found from graphical analysis were pK a1 = 2.85 and pK a2 = 6.78. The values of K a1 and K a2 were obtained directly from these values, giving K a1 = 1.41*10
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This note was uploaded on 04/16/2009 for the course CHEM 1312 taught by Professor Bottomley during the Spring '07 term at Georgia Tech.

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lab7-disc - Experiment 7: pH Study of Phosphoric Acid in...

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