1. Why is it important purify the extracts prior to their identification using NMR and IR...
1. Why is it important purify the extracts prior to their identification using NMR and IR spectroscopy?
2. The procedure requires you that you dissolve crystals in minimum amount of solvent. Why does it not provide a specific volume to dissolve the crystals.
3. In recystiallization, if the crystals dissolve in the vold solvent, why is this considered a bad solvent?
there are 3 questions, please number the answer to each question and be as detailed as you can. Thanks!
Homework Answers
1. Why is it important purify the extracts prior to their identification using NMR and IR spectroscopy?
It is important because you are going to identify 1 molecule which will be containing different types of Hydrogen, and Functional groups. If you have a mixture or impurities, they will show up in th eNMR and IR misleading your analysis
2. The procedure requires you that you dissolve crystals in minimum amount of solvent. Why does it not provide a specific volume to dissolve the crystals.
The solution may be diluted in any volume since this is a QUANTITATIVE analysis, we do not require concnetrations of smple. It is just needed to identify the funcitonal groups
3. In recystiallization, if the crystals dissolve in the vold solvent, why is this considered a bad solvent?
We want to crystallize our pure substance due to supersaturation, i.e., forcing the solid crystals to form due to excess of concnetratoin.
If we add a "bad" solvent, we will have different amounts of substance dissolved. We do not want many of our material to be highly soluble in the "bad" solvent. This "bad" solvent is considered bad if:
It is perfectly miscible and soluble with the solute
It is pretty bad miscible, solid won't even dilute and you will not be able to recrystallize
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where Product C was identified as in the figure
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