Operating procedures for a melting point and melting rate tester
Release time:
2021-11-02
According to the definition of physical chemistry, the melting point of a substance is the temperature at which the substance changes from a solid to a liquid state. In the field of organic chemistry, the determination of the melting point is a basic means of identifying the properties of a substance and is also an important method for purity testing. Therefore, Melting Point and Melting Rate Tester It plays an important role in the chemical industry and medical research, and is an indispensable instrument for the production of organic crystalline substances such as drugs, spices, and dyes.
Operation of the Melting Point and Melting Rate Tester
1. Preparation before use
Place the heating container (beaker) containing the heat transfer solution on the heating furnace of the melting point and melting rate tester. Insert the required melting point thermometer into the thermometer fixing hole so that the bottom of the mercury bulb is more than 2.5 cm above the heating surface (heater). The liquid level of the heat transfer solution is approximately at the immersion line of the thermometer.
2. Power on
Close the power switch and turn the voltage regulator clockwise to heat the heat transfer liquid. Start Melting Point and Melting Rate Tester the "stirring" switch to start stirring the stirrer in the temperature transfer solution.
3. Measurement operation
When the temperature of the temperature transfer solution rises to 10℃ below the lower limit of the specified melting point, turn the voltage regulator to increase the heating rate by 1.0 ~ 1.5℃ per minute (for samples that melt and decompose simultaneously, the heating rate is 2.5 ~ 3.0℃ per minute). After reaching the predicted total melting temperature, cool down. Repeat this 2 ~ 3 times to master the heating rate. Adjust the height of the thermometer so that the wetting line during the entire melting process is just at the liquid level.
When the temperature of the temperature transfer solution rises to 10℃ below the specified melting point limit of the sample to be tested, immerse the capillary tube containing the sample in the temperature transfer solution and attach it to the thermometer. The contents of the capillary tube should be appropriately in the middle of the mercury bulb. Adjust the voltage regulator to achieve the specified heating rate to measure the melting point of the sample.
4. After the test is completed, turn off the power, turn the stirrer clockwise to 0 on the voltage regulator. Remove the thermometer, wipe it dry with filter paper, put it away, and fill in the usage log.
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