In this experiment, 0.05 M acetic acid will be titrated with 0.05 M NaOH in the first part of the lab by using a titration system that includes a burette and analyzed by a LabQuest and pH probe. In the second part of the experiment, 0.25 M buffered acetic acid will be prepared for titration with 0.25 M NaOH and its pH curve will be determined as well through the help of the LabQuest and pH probe. Finally, in Part C of the lab, the same buffered acetic acid prepared in the second part of the lab will be used and 0.25 M HCl will the titrant in the last titration to determine its pH curve. EXPERIMENTAL 1
This experiment included 3 distinct parts, Part A, Part B, and Part C. The titration of a prepared acetic acid solution with a prepared solution of NaOH was observed in Part A. First, for Part A, 50 mL of 0.05 M acetic acid solution was prepared by adding 45 mL deionized water to a clean 150 mL beaker and then adding 5 mL 0.5 M acetic acid to it. Then, 100 mL of 0.05 M NaOH solution was prepared by adding 90 mL deionized water to a 250 mL beaker and then adding 10 mL 0.5 M NaOH stock solution to the beaker as well. Once this was done, the LabQuest and the pH probe were set up using proper lab procedures. The pH probe was correctly unscrewed from the bottle and then pulled out from the cap in order to avoid a vacuum seal that could break the probe. After this was all set up, the burette was conditioned with two 5-10mL portions of water and then two 5- 10mL portions of the prepared 0.05 M NaOH from earlier. Once conditioned, the burette was filled up with the 0.05 M NaOH until it was just below the 0 mL mark and the initial volume was recorded. The burette was then clamped to the ring stand and a 250 mL beaker filled with 50 mL deionized water and 10 mL of the 0.05 M acetic acid solution was placed correctly under the burette for titration. The pH probe was placed into the beaker and then data collection began with the initial volume kept being 0 mL. From then on, 2 mL of NaOH was titrated into the beaker until the pH of the solution reached a pH of 6. At this point, the amount added decreased to 0.2 mL increment until the pH dramatically changed and then stabilized. Once this occurred, six 0.5 mL portions of NaOH were added to the solution. After each addition, the volume was kept and recorded into the LabQuest. This completed one trial for Part A but two more trials were done and all data was saved onto the LabQuest. In Part B of the lab, the titration of buffered acetic acid with NaOH was observed and data from this titration was saved into the LabQuest also for further data analysis. First, 30 mL of buffered acetic acid solution was prepared by adding 1.021 g solid sodium acetate trihydrate to a 100 mL beaker, 15 mL deionized water, and 15 mL of 0.5 M acetic acid solution. Then, 50 mL of 0.25 M NaOH was prepared by adding 25 mL deionized water and 25 mL 0.5 M NaOH to a 100 mL beaker.
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