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An experiment to determine the melting point of different types of wax, specifically paraffin and stearic acid. Students will heat a test tube of wax and record the temperature every 30 seconds to create a temperature vs. Time graph. The melting point will be identified as the temperature where the wax transitions from solid to liquid and back again.
What you will learn
Typology: Exercises
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Principle: The melting point of candlewax is the temperature at which:
Requirements: Test tube with 1.5 cm candlewax Test tube rack Gas burner (Bunsen burner) with tripod and gas Erlenmeyer or beaker Thermometer Stopwatch Clips Method:
temperature is around 90 °C.
Place the thermometer in the wax and put the test tube in the rack.
Observations:
Name: Melting point (°C) Paraffin Stearic acid (C18H36O2) USP Stearic acid (a mixture of palmitic acid and stearic acid) Palmitic acid (C16H32O2)
ca. 54 63 - 64