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Questions and Answers
What is the purpose of decolorization in the recrystallization process?
What is the purpose of decolorization in the recrystallization process?
- To enhance the color of the crystals
- To change the chemical composition of the solute
- To remove colored impurities from the solution (correct)
- To increase the solubility of the impurities
Why should the solvent's boiling point be lower than the solid's melting point in recrystallization?
Why should the solvent's boiling point be lower than the solid's melting point in recrystallization?
- To speed up the crystallization process
- To prevent the formation of crystals
- To avoid 'Oiling Out' of the solid (correct)
- To increase the solubility of the solid
What are the characteristics of the 'best' solvent for recrystallization?
What are the characteristics of the 'best' solvent for recrystallization?
- Solubilizes solid near or at its boiling point, solubilizes impurities on cold, and does not react chemically with purified solid (correct)
- Solubilizes solid at its melting point, reacts chemically with impurities, and forms poorly-defined crystals
- Does not solubilize impurities, has a boiling point higher than the solid's melting point, and is difficult to remove from purified solid
- Solubilizes solid at room temperature, reacts chemically with purified solid, and has a high boiling point
Why is it important for the solvent to be easily removed from the purified solid crystals?
Why is it important for the solvent to be easily removed from the purified solid crystals?
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What is the role of water as a solvent in recrystallization?
What is the role of water as a solvent in recrystallization?
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Study Notes
Recrystallization Process
- Decolorization is a crucial step in recrystallization to remove impurities and achieve pure crystals, as it allows the removal of colored impurities that may be present in the solution.
- The boiling point of the solvent should be lower than the solid's melting point to ensure that the solvent does not boil vigorously during the recrystallization process, which can lead to the formation of impurities or the loss of the solid.
Characteristics of the 'Best' Solvent
- The ideal solvent for recrystallization should have a high solubility for the solid at elevated temperatures, but a low solubility at lower temperatures, allowing for the formation of crystals as the solution cools.
- The solvent should also be able to dissolve the impurities, but not the desired solid, to facilitate the separation of the pure solid from the impurities.
Importance of Solvent Removal
- It is essential to easily remove the solvent from the purified solid crystals to produce a dry, pure solid, as the presence of solvent can affect the solid's properties and stability.
Role of Water as a Solvent
- Water is a common solvent used in recrystallization due to its high solubility, low cost, and ease of removal, but it may not be suitable for all solids, as some may react with water or be insoluble in it.
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