Determining the melting point

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  • Publicado : 6 de marzo de 2012
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INTRODUCTION
The melting point of a compound is the temperature at which the substance transforms from a solid to a liquid state. Throughout the melting development, all of the energy that was addedto the substance is consumed as heat of fusion, and the temperature will be the same. Obtaining the Melting Point is an easy method used in numerous different areas of chemistry to get the purity ofa substance. When a compound has some impurities it will affect at which temperature the melting point is. In this experiment the compounds used were Benzoic acid, Naphthalene, and Trans CinnamicAcid.
OBJECTIVE
The purpose of this experiment is to determine the melting point of benzoic acid, Naphthalene and Trans Cinnamic Acid. Knowing the melting range is significant for various areas, in thelaboratory and industry know the melting range may allow you to give you an idea in one way in which different temperatures can separate compounds by melting point and a still solid and other liquid.PROCEDURE
First of all we took the three substances (benzoic acid, Naphthalene and Trans Cinnamic Acid) and an unknown compound. After that we cracked the compounds until we got powder so we couldfill the capillary tubes. Then we placed the three tubes inside of the Mel-Temp until they convert from solid to liquid. Consequently we recorded the temperatures their melting point. Lastly for theunknown substance we did the experiment twice. On the first round we did it in a fast way, it means that placed the capillary tube and then we made temperature higher very quickly. In the last round wedid the same but in this case the temperature was getting higher slowly.
RESULTS AND DISCUSSIONS
According to the provided information the melting points of Benzoic Acid is 121C-122C, Naphthalene79C-83C and Transcinnamic Acid 133C-134C.
We got these results:
• Naphthalene 78-82
• Benzoic Acid 120-122
• Trans Cinnamic Acid 132-134
• Unknown : fast 118-120 and Slow 122-124
Since we...
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