Freezing Point Of Napthalene Essay

771 words - 4 pages

Freezing Point of NaphthaleneI. PurposeTo determine the freezing point of a known substance, naphthaleneII. Materialsringstand gas sourcetest tube test tube clampsthermometer naphthaleneBunsen burner goggleshose stopwatchIII. Procedure1. Assemble the Bunsen burner, attaching one end of the hose to the burner and theother to a gas source.2. Assemble the ring stand so that a ring clamp is attached to the stand holding thetest tube that will be used in the experiment.3. Fill the test tube to approximately 1/8 capacity with naphthalene crystals.4. Place the thermometer in the crystals so that it is surrounded by the naphthalenepowder but not touching the sides or bottom of the test tube. Use a clamp to holdthe thermometer in place.5. Ignite the Bunsen burner and ...view middle of the document...

IV. DataTime Elapsed Temperature of Naphthalene Time TemperatureInitial (0:00) 100oC 7:00 78.5oC0:30 97.5oC 7:15 78.3oC1:00 93.0oC 7:30 78.3oC1:30 89.5oC 7:45 79.0oC2:00 86.1oC 8:00 79.0oC2:30 84.6oC 8:15 79.0oC2:45 82.3oC 8:30 79.0oC3:00 81.2oC 8:45 79.0oC3:15 81.0oC 9:00 79.0oC3:30 80.5oC 9:15 78.5oC3:45 80.2oC 9:30 78.1oC4:00 80.0oC 9:45 78.0oC4:15 79.9oC 10:00 78.0oC4:30 79.8oC 10:15 77.5oC4:45 79.4oC 10:30 77.0oC5:00 79.1oC 10:45 76.5oC5:15 79.1oC 11:00 76.0oC5:30 79.0oC 11:15 75.2oC5:45 78.9oC 11:30 73.8oC6:00 78.8oC 11:45 73.0oC6:25 78.8oC 12:00 72.1oC6:30 78.7oC 12:15 71.1oC6:45 78.6oC 12:30 70.3oCV. Graph(See following pages)VI. CalculationsUsing 80.1 oC as the theoretical value for the freezing point of naphthalene, we can nowdetermine percent error.Percent Error = ((Theoretical - Experimental) / Theoretical) x 100Percent Error = ((80.1 oC - 79.0 oC) / 80.1oC) x 100Percent Error = 1.4%VII. ConclusionsIn this lab, we heated the known substance naphthalene in a test tube to approximately100oC 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 accquired in this lab was minimal and easily explained.

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