First, experimental principle:

The melting point of a substance refers to the temperature of the substance when it changes from solid to liquid. In the field of organic chemistry, melting point measurement is the basic segment to identify the nature of the substance and one of the important methods to determine the purity. The melting point of the sample is measured by the full-automatic melting point instrument. The full-automatic melting point instrument combines the high-precision temperature control technology and high-definition video camera technology perfectly, which not only provides the user with accuracy, stability and feasibility Relying on the test results, but also for users to bring efficient and convenient test experience. HD video can easily and clearly see the whole process of sample melting, so that users can accurately measure the melting point and melting distance of the sample.

Second, experimental apparatus and preparation:

Experimental apparatus: automatic melting point instrument, grinding, sample;

Preparation: sample (sample sent by customer) capillary;

Third, experimental steps:

1) Sample pretreatment: preheat, grind and fill the sample with 3-5mm (generally refers to the height of the sample after melting), and fill with appropriate height according to the shape of the sample.

2) Start up test of melting point tester: turn on the melting point tester to set parameters

3) Test data

The melting point of the sample is 40-43 ℃, and the data of the automatic melting point tester is 41.5 ℃, which is qualified.