Is melting point higher in crude or pure organic substances? Why or why not?

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Is melting point higher in crude or pure organic substances? Why or why not?

2007-01-21 05:44:05 · 2 answers · asked by Mandy 1 in Science & Mathematics ➔ Chemistry

2 answers

Impurities in an organic substance will lower the melting point.

There are probably several reasons involving strain in crystal structures and an increase free energy why the melting point is lowered.

This is probably a general rule, I'm sure there are exceptions.

2007-01-21 06:02:45 · answer #1 · answered by LGuard332 2 · 0⤊ 0⤋

This will always be true for any dissolved impurity. For a single impurity the lowering of the mp = Kf*molality of the impurity. It is a colligative property sort of thing.

2007-01-25 12:50:16 · answer #2 · answered by Richard 7 · 0⤊ 0⤋