Naz S.

asked • 03/22/22

how can you check the purity of your compound before recrystallization?

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Inactive Tutor answered • 03/22/22

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You could check the melting point to see if it matches the compound's known melting point.

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Naz S.

Should that be after recrystallization
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03/22/22

Inactive Tutor

Not if you want to check the purity before recrystallization. The reason you take melting point it to indicate whether or not you have the correct product and whether or not it is mostly pure. If it is not pure, then the other substance will either melt early or late.
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03/22/22

Naz S.

What about after recrystallization?
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03/23/22

Gabriel R.

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If the compound has a known melting point, you can check the melting point again after recrystallization. Another method would be using nuclear magnetic resonance (NMR) and comparing the signals to what you're expecting the compound to have.
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03/23/22

Inactive Tutor

If you want to know the exact purity you would have to use NMR, IR spectroscopy, etc. But, I don't think you would bother to do this before recrystallization.
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03/23/22

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