Discussion7 - Lauren Taranow 10-29-11 Unique: 51070 lmt827...

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Lauren Taranow lmt827 10-29-11 Unique: 51070 Discussion 7: Acid/Base Equilibrium and Buffers The objective of Part I of the experiment was to conduct a weak acid-strong base titration accurately and determine the equivalence point. Also this experiment teaches how to calculate the pK a and K a of the weak acid. In the experiment, 100 mL 0.075 M acetic acid was titrated with 0.050 M sodium hydroxide 3 times. The pH and volume of NaOH were recorded throughout the titration, and this data was used to determine the equivalence point using Gran plots and titration curves for each trial. The buffer zone on the titration curve is the flat part of the curve before the steep pH incline. It shows the buffer capacity of the buffer being used, or in the amount of hydroxides from NaOH that could be added to the protons in acetic acid without dramatically changing the pH. The pH range of the buffer zone in the first titration is about 4-5 and the volume of NaOH used in this buffer zone is between 5 mL and 10 mL. The equivalence point occurred when the moles of NaOH added equaled the moles of acetic acid in the solution. The equivalence point was determined by looking at the titration curve of pH vs. volume of NaOH data from each trial, as
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This note was uploaded on 04/02/2012 for the course CH 101 taught by Professor Sutcliffe during the Spring '08 term at University of Texas at Austin.

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Discussion7 - Lauren Taranow 10-29-11 Unique: 51070 lmt827...

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