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Experiment2-Fall2010 - Chem 207 Experiment No 2 pH...

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Chem 207 -- Experiment No. 2 pH Titrations of Weak and Strong Acids Fall 2010 A. Introduction: In this experiment, pH titrations will be done on HCl, a strong acid, and HOAc (acetic acid), a weak acid. From the titration curves and equivalence points the initial concentration of each acid solution will be determined. In addition, different aspects of each of the titration curves can be seen. B. Objectives 1. To carry out replicate titrations on a strong acid (hydrochloric acid, HCl) and a weak acid (acetic acid, HOAc) to a visual end-point using phenolphthalein as the indicator. 2. To develop titration curves for the titration of the same acids using a pH meter. Compare the end points obtained from the pH meter vs. the indicator for each acid. 3. From the titration experiments determine the initial concentrations of each of these acids. 4. Determine the K a of HOAc using the Henderson-Hasselbalch equation. 5. Identify the type of acid (HCl or HOAc) and the concentration of an unknown acid sample. C. Key Chemical Equations KHP + NaOH KNaP + H 2 O HCl + NaOH NaCl + H 2 O HOAc + NaOH NaOAc + H 2 O Where OAc = CH 3 C(O)-O D. Theory and Background Refer to lecture material and references below.
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B. Procedure 1. Preparation of CO 2 -Free Water: Boil ca. 1 liter of DI water in a 1 liter Florence flask for a minimum of 20 minutes. After removal of the flask from the hotplate
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Experiment2-Fall2010 - Chem 207 Experiment No 2 pH...

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