1212Exp7 - Experiment 7 Potentiometric Titration Valdosta...

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Experiment 7 Potentiometric Titration Valdosta State University
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Purpose To accurately determine the molar mass and pK a of an unknown weak acid. Valdosta State University
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Background In this experiment, the pH of a solution will be measured directly as the sodium hydroxide is added. The pH will be measured using a glass combination electrode. This device measures pH (or [H 3 O + ]) as voltage. Valdosta State University
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Background Valdosta State University pH Combination Electrode combination refers to the ion sensing cell and the reference cell .
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Background Valdosta State University pH Combination Electrode combination refers to the ion sensing cell and the reference cell.
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Background Valdosta State University Consider the following graph: 3 4 5 6 7 8 9 10 11 12 13 0 5 10 15 20 25 30 35 Volume NaOH (mL) pH
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Background Valdosta State University Consider the following graph: 3 4 5 6 7 8 9 10 11 12 13 0 5 10 15 20 25 30 35 Volume NaOH (mL) pH In this region H + dominates, the small change in pH is the result of relatively small changes in H + concentration.
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Background Valdosta State University Consider the following graph: 3 4 5 6 7 8 9 10 11 12 13 0 5 10 15 20 25 30 35 Volume NaOH (mL) pH In this region, relatively small changes in H + concentration cause large changes in pH, The midpoint of the vertical region is the equivalence point.
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Background Valdosta State University Consider the following graph: 3 4 5 6 7 8 9 10 11 12 13 0 5 10 15 20 25 30 35 Volume NaOH (mL) pH In this region OH - dominates, the small change in pH is the result of relatively small changes in OH - concentration.
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HA(aq) + NaOH(aq) NaA(aq) + H 2 O(l) This experiment will use monoprotic acids. Therefore, at the equivalence point,
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1212Exp7 - Experiment 7 Potentiometric Titration Valdosta...

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