In this lab, we heated the known substance naphthalene in a test tube to approximately
100oC and observed its temperature while it cooled to approximately 70oC. Over a time period of 12 minutes and 30 seconds, we recorded the temperature at regular 15 second intervals, and, with this data, constructed a chart showing the general curve. Upon inspection of the graph and our data chart, we found the experimental freezing point of naphthalene to be around 79oC. This results in 1.4% error when compared to the actual value for the freezing point of naphthalene, 80.1oC. Considering the impurities in the consumer grade naphthalene, the interference of outside air on the temperature of the test tube and its contents, and the inaccuracy of 1/10 measurements on a thermometer graduated by whole numbers, the error we acquired in this lab was minimal and easily explained.
St. Rosemary Educational Institution. "Freezing Point of Naphthalene Lab Answers." http://schoolworkhelper.net/. St. Rosemary Educational Institution, Last Update: 2017. Web. Retrieved on: Saturday 25th February 2017. http://schoolworkhelper.net/freezing-point-of-naphthalene-lab-answers/.