mixedmeltingpoints

mixedmeltingpoints - Annika Rose Chem 3AL Experiment 3...

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Annika Rose October 11, 2010 Chem 3AL Experiment 3: Mixed Melting Points Purpose: to identify an unknown compound using melting point ranges Discussion: Part I: The preliminary melting point range of my solid was 123.2-124.4 C when increasing temperature by 6 C. When increasing temperate by 2 C, I found the melting point range to be 122.0-123.3. Then, I found a classmate with a similar melting point range of 120.1- 122.0. The mixed melting point range after we mixed our solids was found to be 121.3- 123.5. Part II: The parabolic curve of the data shows that as the ratio of A:B gets closer to 1:1, the mixed melting point decreases. As either A or B starts to outweigh the other, the melting point increases, creating a depressing in the middle. The eutectic point occurs at this minimum, around 40:60-50:50. This represents the point where the composition goes directly from a solid to a liquid when the melting points of different ratio mixtures becomes equal.
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