what advantages does ethanol have over 1-octanol as a crystallization solvent? hexane over pentane?

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what advantages does ethanol have over 1-octanol as a crystallization solvent? hexane over pentane?

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Assuming that either solvent is otherwise acceptable in a given instance, what advantages does ethanol have over 1-octanol as a crystallization solvent? hexane over pentane? water over methanol?

Answer & Explanation (1)

Explanation
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Answer
In crystallization, the impure solid is dissolved in the minimum volume of the suitable solvent. The solvent is unsuitable in a case if whole of the solid goes into solution at room temperature or cold solvent. If the solid is dissolved upon heating and then throws out maximum crystals on cooling, therefore the solvent will be considered suitable.

Dielectric constant is the property of solvent which lessen the force of attraction between molecules. In this case, ethanol has a higher dielectric constant than 1-octanol. Therefore, minimum volume of ethanol is used as recrystallization solvent rather than 1-octanol for the maximum recovery.

Hexane has a higher dielectric constant than pentane. Thereby minimum volume of hexane is used as a recrystallization solvent rather than pentane for maximum recovery. Water also has a higher dielectric constant than methanol. Therefore, minimum volume of water is used as a recrystallization solvent rather than methanol for the maximum recovery.

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