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Mixed Melting Points

Mixed Melting Points - Sophie Scheidlinger Mixed Melting...

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Sophie Scheidlinger Mixed Melting Points March 5, 2008 Purpose: To be able to identify and characterize unknown compounds through their melting points and mixed melting points. Discussion: In part I, it was confirmed that a pure substance consistently melts within a temperature range, called the melting point. A soluble impurity depresses and broadens the mp of the pure substance. Once the mp of solid A was found, other solids with mp ranges within 4°C of solid A were separately mixed with A. If the mixture had a depressed and broadened mp, than it was determined that the substances were different from one another. If the mixture’s mp was identical to A’s mp, then the substances were identical to each other. In part II, student 3 of the 90:10 ratio and student 1 of the 10:90 ratio were left out. Their mp was too broad, and their starting temperature was too low. They may have incorrectly assumed the sample was sweating before it really was due to human error.
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