Melting point analysis: Describe the effect of impurity on the melting points of
ID: 1061569 • Letter: M
Question
Melting point analysis: Describe the effect of impurity on the melting points of compounds. Recrystallization: Explain why is the solubility of a compound important in the recrystallization process. Extraction: Be able to calculate partition coefficient and the amount of sample extracted into an organic layer using partition coefficient. Polarimetry: Be able to calculate specific rotation. Distillation: Be able to describe and explain boiling point composition curve and the formation of an azeotrope. Synthesis: Be able to calculate % yield. Synthesis: Describe the use of reflux in organic synthesis. Be able to describe what it is and why we use it. Thin layer chromatography: Be able to explain how it can be used to identify the presence of a desired product. Column Chromatography: Be able to explain the effect of solubility in separation of mixtures.Explanation / Answer
Q1
Melting point analysis
impurities will typically increse (incorrectly) the melting point of a specie
This is due to colligative properties in solutions, addition of impourities increase the melting point and boiling points of species
Q2
Recrystallization --> Solubility is the property of a salt/solid to form either a solid precipitate or a ionic solution.
If it has low solubility, then expect crystla formation
Q3
Partition coefficient is essentially:
K = [concentration of i in layer A] / [concentration of i in layer B]
simply differentiate how well i distributes in A and B
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