Experiment 7 - Experiment 7: Acid-Base Titrations using a...

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Experiment 7: Acid-Base Titrations using a pH Meter Derek Ems Lab Partner: Jon Pool TA: Rachel December 5, 2007 1. Graphs 2. Tables Volume of NaOH needed to reach equivalence point pH value at the equivalence point Titration 1 41.5 ml 6.3 Titration 2 18.1 ml 8.7 Titration 3 18.7 ml 9.45 3. A. Theoretical Initial pH for strong acid, weak acid, and buffer solutions
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another because the strong acids disassociate more than the weak acids. C. Theoretical Initial pH Experimental Value pH Percent Error Titration 1 .65 1.12 41% Titration 2 2.7 2.82 4.3% Titration 3 2.7 4.65 42% Discrepancies could have occurred because the pH meter is not absolute and the values tend to shift back and forth over time when you are trying to measure the pH. The values could have been better for titration 1 and 3 if the pH was allowed to settle for a longer period of time. 4.
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This note was uploaded on 04/16/2008 for the course CHEMISTRY 101 taught by Professor Pasternack during the Spring '08 term at Johns Hopkins.

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Experiment 7 - Experiment 7: Acid-Base Titrations using a...

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