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Melting Point Lab

Melting Point Lab - Melting Point The melting point of a...

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Melting Point 1 Melting Point The melting point of a compound is the temperature at which liquid and solid phases coexist in equilibrium under atmospheric pressure. The melting point is recorded as a melting-point range. The first number of the range is the point when the crystals start to melt and the second number is the point at which the solid is completely melted to liquid. For example, benzhydrol has a melting point range of 65-67 °C, that means the compound melted over a 2-degree range. The melting point not only can be used in organic chemistry to identify an unknown but it can also be used to determine the purity of a compound. There are two ways to determine the purity of a compound using melting points. First, the purer the compound, the narrower the melting point range. A melting point range is generally accepted to have a range of 3 °C. Second, impurities also cause the melting point to be lower than that of a pure compound (melting point depression). Preparation: Mayo pg 52-56; View the "Melting Point Determination" DVD in the Vasche Library prior to this experiment. Purpose: Identify an unknown substance by first determining the melting point of the unknown, and then using mixed melting points to confirm the identity of the unknown. Procedure: Melting point of an unknown compound. Melting point determination is a simple, but critical skill for every organic chemistry student to learn. Therefore, this experiment will be performed individually.
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