A Calibration of Thermometer

Preparation Sign in at www.cengage.com/logln to answer Pre-Lab Exercises, access videos, and read the MSDSs for the chemicals used or produced in this procedure. Read or review Sections 2.7 and 2.9. 

Apparatus Capillary melting-point tubes, packing tube, and melting-point apparatus. 

Protocol Carefully determine the capillary melting points of a series of standard substances. A list of suitable standards is provided in Table 3.2. The temperatures 

Plot the corrections in your notebook as deviations from zero versus the temperature over the range encompassed by the thermometer. This allows you to tell, for example, that at about 130 C the thermometer gives readings that are 2 °C too low, or that at 190 °C the readings are about 1.5 °C too high. These values should then be applied to correct all temperature measurements taken. The corrections you obtain are valid only for the thermometer used In the calibration. If you break it, not only are you likely to be charged for a replacement, but you must repeat the calibration. 

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