colligative property. In this experiment, lauric acid was used as the solvent and benzoic acid as the solute (Hall et al 201). The freezing point depression was obtained by subtracting the freezing temperature of the mixture from the freezing temperature of the pure lauric acid. Material list: Lab Quest Lab Quest App Temperature Probe Two 18×150mm test tubes 400mL beaker Ring Stand Lauric acid Lauric acid-Benzoic acid mixture Hot water bath
Last name 2 Utility Clamp Paper towel or tissue
Procedure: Laboratory safety skills, which include wearing a lab coat, safety googles and gloves, were applied at the start of the experiment. The Lab Quest machine’s settings were changed to suit the experiment. The procedures were categorized into part 1 and part 2. In part 1, the freezing temperature of pure lauric acid was determined and in Part 2, the freezing temperature of lauric acid and benzoic acid mixture was determined. About 300mL of tap water was added to a 400mL beaker. The beaker was placed on the base of the ring stand. The utility clamp was used to obtain a test tube containing hot, melted lauric acid. A temperature probe was inserted into the hot lauric acid and the utility clamp fastened to the ring stand so that the test tube was above the water bath. Data collection was started and the temperature probe was used to continuously stir the lauric acid for the ten-minute duration of the experiment. The temperature probe was removed from the lauric acid carefully and a paper towel used to wipe excess lauric acid liquid from the probe. The freezing temperature was obtained and recorded. Part 2 of the experiment began with obtaining a test tube of melted solution of benzoic acid dissolved in lauric acid. The precise masses of the benzoic acid and lauric acid were recorded. The data was collected as in part 1. The freezing
You've reached the end of your free preview.
Want to read all 7 pages?