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Titrations and pH Curves Lab.pdf - Titrations and pH Curves...

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Titrations and pH Curves LabLauryn McKennaAshlynn Adams and Leah BurgePD 2B19February 2020
AnalysisM1V1=M2V2[HCl] = .090 M[CH3COOH] = .010 MInitial pH, pH at equivalence point, ending pH:Strong Acid (HCl): 1.70, 6.16, 12.6Weak Acid (CH3COOH): 3.44, 9.68, 12.0At the initial point of the graph, the pH of the weak aid is higher than the initial pH of the strongacid. This is because the strong acid is very acidic, and the weak acid is not as acidic. At thispoint of the solution, for the strong acid, HCl ions are present, and for the weak acid, CH3COOHions are present. At the equivalence point, the mol NaOH added equals the mol of HCl added(and mol of CH3COOH in the weak acid titration). As more titrant is added, the pH will continueto rise, since OH-ions will continue to saturate the solution, thus making the solution more basic.In the weak acid titration, CH3COOH has a conjugate base pair, CH3COO, so those ions arepresent as well, where all the ions dissociate in the strong acid titration.

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