1. The contamination of a pure organic with an impurity affects the observed mel
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Question
1. The contamination of a pure organic with an impurity affects the observed melting point only if the impurity dissolves to some extent in the liquid phase of the organic compound. Therefore, small granules of sand or broken glass (sand and glass have similar compositions, melt only at very high temperatures, and are totally insoluble) will not reduce the melting point of a pure organic compound with which they might be mixed. In a sample i.s. containing small grains of sand, what would you observe in the Mel-Temp apparatus when you melt the sample that would indicate to you that your sample contained this type of impurity? (How would the melted sample look different than the melted sample of a sample without the added contaminant?)Explanation / Answer
As we know that there is no effect of sand on the melting point of chemical, the chemical melts at its own melting point. But once the sample melts, that is it turns to liquid phase and the sand granules settles at the bottom. Then it appears as two phases one is solid phase and the other is liquid phase at the melting temperature. When the sample doesnt have sand it appears as clear, that is one see only liquid phase.
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