Force of Attraction: Force of attraction also has a huge impact on the melting point of a compound.However, if the molecules are loosely connected the melting point would be much lower. In case the molecules of a component are close to each other, the melting point will be higher. Size of the Molecule: the structure and size of a molecule have a huge role to play in the melting point of an organic compound.Some of the factors affecting the melting point of a substance are as follows: The first change might be because of dehydration, change of colour, change in the crystallization state, individual isolated crystals start to melt without the liquid showing up as a cohesive phase, also known as sintering point and condensation in the coolest points of the tube. This helps to determine the melting range of a compound.ĭuring melting point determination, we can see several noticeable changes that take place in the three capillaries. At this stage, the initial melting stage and final melting of all components will be observed. Slow heat should be used to ensure more accurate measurement when observing the melting point.Once this is done, the eyepiece will be adjusted and the sample will be observed using the Mel Temp Apparatus.With the usage of a black heating knob for controlling heat.Green LED will be switched on for power.Now, in the next step, capillaries will be added to the channels present in the front of the thermometer tab.Insert the thermometer into the thermometer well.Mel Temp Apparatus includes a thermometer, melting point tube, tube channels, eyepiece and a heating control knob. Read More: Change of State: Melting Point and Boiling Point and its Application Mel Temp Apparatus The thermometer bulb and the capillary tube should have thermal equilibrium at the melting point.The heating will be slow here, in order to properly observe the melting.

It is important to ensure that the rubber does not get dipped into the oil, this can lead to the rubber melting.

The substance which is to be observed will be added to the capillary tube, now a rubber tube is tied to it.

There are two commonly used methods for determining the melting points of organic compounds:įor this method, we need a Thiele tube that is designed to contain oil and experiment with heat along with other items such as capillary, thermometer, a bunsen burner and a rubber band. Methods of Determining the Melting Point of Organic Compounds The melting is also impacted by the change in the molecular structure of different substances/components. While substances that have impurities have a higher level of melting point and also have a broader range of melting points. Pure substances will have a lower degree of melting point around a range of one or two degrees. Melting point determination helps in observing the purity of different substances. Determining the Melting Point of Organic Compounds

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