lab_exp7 - points there were. In the case of HCl there was...

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Experiment 7: Titration of 7-Up Chemistry 1046L
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Purpose: The purpose of this lab is to learn and understand the process of titration and the titration curves resulting from strong and weak acid titrations. Also standard measuring techniques are reinforced along with practice of stoichiometry. Procedure: There were no changes to the procedure. Dillon, Stephanie. “Titration of 7-Up.” CHM1046L Online Manual . Fall 2011. 21 September 2011. <http://www.chem.fsu.edu/chemlab/chm1046lmanual/titration/index.html > Data: NaOH and HCl: Phosphoric Acid and NaOH: (SA) Citric Acid and NaOH: (WA) Concentration and Ka: NaOH [1 st Trial]= 0.0044 [2 nd Trial]= 0.0044 Average= 0.0044 Concentration and Ka: Phosphoric acid [Phosphoric Acid] = .032 M Concentration and Ka: Citric acid [Citric Acid] = .032 M Moles in a can of 7-Up = 1.92 Calculations:
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Conclusion: The concentrations of HCl, Phosphoric acid, and citric acids were found to be .0044 .032, and . 032 respectively. The Ka values found varied in number depending on how many equivalence
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Unformatted text preview: points there were. In the case of HCl there was only one, but with phosphoric acid and citric acid there were three. The values calculated for HCl was . The three Ka values for phosphoric acid were calculated to be , and . The three Ka values for citric acid were calculated to be , , and . These values were found to have a large margin of error from 100% with HCl to 10.9% with citric acid. This could be due to the incorrect determination of the equivalence points. From the titration curves it can be observed that with a weaker acid the pH jumps to a higher value more quickly and suddenly. The strong acid curve is more constant at the beginning and then shoots up. Errors could be derived from improper measuring of the acids. Also if the pH meter was not cleaned properly, residue from the previous solution could be on the tip creating an inaccurate reading of the pH....
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lab_exp7 - points there were. In the case of HCl there was...

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