HW 2. In order for melting point depression to be observed, the impurity must be
ID: 715213 • Letter: H
Question
HW 2. In order for melting point depression to be observed, the impurity must be soluble in the compound. Insoluble impurities such as sand or charcoal will NOT depress the melting point. However, impurities are not always other solids. An impurity that effects a melting point depression could also be a liquid! Look back at the steps for recrystallization (individual practice 1) Explain the purpose for performing step 10 and discuss what effect skipping this step would have on your recorded mp data and your % recovery data.Explanation / Answer
If step 10 was recrystalisation, then this answer holds.
Recrystalisation is the process of purification technique. It involves dissolving the solid in a hot solvent then cooling in a way that impurities are separated, leaving crystals of pure compound (almost no impurity) . This is helping purify compound and when you check the meliting point you oberserve no or very small depression from the theoretical melting point.
Drying of sample is very important to allow solvent (organic or aq) to evaporate so that it does not interfere with melting point analysis as depression in melting point would be oberved otheewise.
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