Experiment 14 part 1 (2).pdf - Experiment 14 Part 1...

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Experiment 14 Part 1 Complete before lab. Goal: Interpret conductivity experiments and identify weak and strong acids and bases. Procedure: Thompson, S. PSU Chemtrek: Expt. 14 Acid Base Equilibria; Keiser, J., Hayden-McNeil Publishing: Plymouth, MI, 2020, pp 14-1 to 14-39. Section A. Conductometry and the Strength of Acids and Bases Complete before lab. Watch the video and follow along with the steps in your lab manual. In the space below, please summarize the procedure for this section and record any observations you are able to make watching the video. The conductivity probe used in this part of the experiment is first cleaned using distilled water. The probe was placed into the first sample, distilled water, which gave no conductivity reading. The second sample, tap water, had a reading of about 5/10. Acetic acid is tested next with a reading of 4/10. Ammonia Ammonium solution fluctuated a little bit, but stabilized at about 5/10. Sodium hydroxide had a reading of 8/10. The last sample, hydrochloric acid, had a reading of 9/10. It should be noted that the probe was cleaned in between each sample, so as to not cause any mistakes or misreadings. Question 1: Arrange the six solutions tested from the lowest to the highest conductivity. Explain the order observed—i.e., why do solutions of the same concentration have different conductivities? If you cannot differentiate between them, explain why not.
Question 2: The conductivity of an H 2 SO 4 solution was followed as it was titrated with the strong base Ba(OH) 2 Predict the relative conductivities of: H 2 SO 4 + Ba(OH) 2 BaSO 4 + 2H 2 (a) the starting solution . O
(b) the solution at the equivalence point
(c) the solution well past the equivalence point

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