The Dissociation Constants Of Weak Monoprotic Acids Were Determined With The Aid Of A Buffer And Ph Meter

888 words - 4 pages

Experiment # 4: Dissociation Constant Weak AcidsIntroduction: The dissociation constants of weak monoprotic acids were determined with the aid of a buffer and pH meter.Experiment: This experiment was performed according to the procedures as provided in the Chemistry 111B laboratory manual: Po, Henry and Senozan, N. "General Chemistry Experiments Chemistry 111B", 8th Ed., 2004 Hayden-McNeil Publishing, pp 80-88. To determine the dissociation constants of weak monoprotic acids (HX and HY), a buffer was needed to calibrate the pH meter. According to the manual, all four solutions to the experiments had to be carried out first before the calibration was performed. The following materials were ...view middle of the document...

The first step was to obtain a packet of perpHect pH 4.01 buffer and set up the open packet in a beaker. The next step was to place the pH meter into the buffer and calibrate the reader that was connected to the meter. When the reader was calibrated to a pH of 4.01, the solutions were ready to be determined. After each measurement in the solution, the pH meter had to be cleaned with a few drops of distilled water and calibrated back to 4.01 in the buffer pouch.Results and Discussions: In the first half of the experiment using HX, the pH reading for the first part of the experiment was 2.36 and the temperature was 26 C. When equilibrium was reached, it was calculated (on data sheet) that the Ka was 2.03 X 10 .In the second part of the experiment, the pH was 4.94 and the temperature was 28 C. The Ka was found to be 2.07 X 10 . For the third part of the experiment, a 4.47 pH was measured from the solution and a temperature of 27 C. The Ka for this part was 2.57 X 10 . Lastly, the pH of the solution for part 4 was 4.47 and had a temperature of 27 C with a Ka reading of 2.29 X 10 .3For the second part of the experiment dealing with HY,...

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