Melting Point Determination

This larger start bea-to- illume ratio allows for a sharper more accurate liquescent signalise. 4. Approximately 20 crystals should be loaded onto the coveralls to ensure that the sample is het up evenly. 5. The temperature of the stage should be ICC below the expected melting point when you lead off to heat 1-ICC per minute. 6. The melting point range would increase because the heat would not be able to properly penetrate the sample evenly. This would make the totality of the large uncrushed sample have less exposure to the heat, and it would melt more slower than a small and evenly spread sample. . It is important because if the temperature is increase too rapidly at the elating point, the sample and the aluminum stay will not be at the thermal chemical equilibrium with the thermometer. 8. promptly heat energy the sample results In too high of a information because the sample and aluminum bock argon not at equilibrium with the mercury in the thermometer and this will r esult In a actually high reading. 9. A mixed melting point analysis Is preformed to discover the identity of an undiscovered sample.The un cognise sample Is placed In the heating apparatus and heated using a true (slow) melting point. once the melting point of the unmapped Is determined, the known samples are mixed with the unknown to see which one matches the melting mint of the unknown. If the unknown sample and the known sample melt at the same temperature as the unknown past they are the same compound. If they melt before the melt point of the unknown then It Is an Impure compound exhibiting a depressed melting point.This dash we are able to Identify the Identity of the unknown. 10. A. B and C are the same compounds. B. A Is different from B and C. C. It would be very resembling to the melting point of B + A since B and C are the same. Therefore It would be approximately 45. 1 53. ICC. Crushing the sample allows for great surface area-to-volume ratio of the powder, equ ilibrium with the thermometer. . Rapidly heating the sample results in too high mercury in the thermometer and this will result in a very high reading. . A mixed melting point analysis is preformed to determine the identity of an unknown sample.