0
1) It will have a boiling point that is lower than the melting point of the solid being recrystallized; 2) The compound will be soluble in the boiling solvent but have poor solubility in the same solvent after cooling; 3) Small amounts of impurities present in the crude solid will be soluble in the chosen solvent at any temperature
Wiki User
∙ 14y ago
Wiki User
∙ 9y agoSolubility behavior that an ideal crystallization solvent should possess is very high solubility at high temperatures and very low solubility at low temperatures.
Add your answer:
Earn +20 pts
Will acetanilide dissolve in hot heptane?
Yes. Heptane is an ideal recrystallization solvent for acetanilide.
What is the disadvantage of having excess solvent during recrystallization?
what is the disadvantage of having excess solvent during recrystalization
What impurity is removed during the recrystallization process?
Only those impurities can be removed which are soluble in solvent used.
Solvent for recrystallization?
A good solvent for recrystallization depends entirely on the polarity of the solid you're trying to purify. For example sodium chloride readily dissolves in water whereas naphthalene dissolves only in nonpolar solvents like hexane. To select a good solvent first consider the polarity of the compound of interest and pick a solvent that has the potential to dissolve it. Next suspend the solid in that solvent. You must pick another solvent if the solid completely dissolves in the selected solvent. Heat the mixture while stirring. If you reach the boiling point of the solvent and the compound hasn't dissolved, you must find a different solvent or add more of the solvent you are currently using. If your solid completely dissolves without too much of the chosen solvent, you have yourself a good solvent for recrystallization. To continue with the recrystallization simply allow the solvent to cool and your solid should precipitate out in the form of crystals. Put it in an ice bath to assist with the precipitation. The latter technique can lead to small crystals or powder. The best way to remedy this is to do a slow recrystallization. To do this you must use two solvents that will evaporate over a long period of time. One solvent must be very volatile and must be able to easily dissolve your compound at room temp. The other must be less volatile and your compound must be insoluble in this solvent. Note that this solvent must have the potential for dissolving the impurities in your compound. To perform the recrystallization, dissolve your compound in the "good" solvent and then add about the same amount of the "bad" solvent. Over a period of time, the "good" solvent should evaporate leaving your crystallized product in the "bad" solvent without any impurities.
What advantages does water has as a recrystallization solvent?
its cheap, has high temp range of 100 degrees, nonflammable, nontoxic
Will acetanilide dissolve in hot heptane?
Yes. Heptane is an ideal recrystallization solvent for acetanilide.
What are the desirable properties of a recrystallization solvent?
One property that a solvent should have to be well suited for recrystallization of a particular compound is high solubility. It should also readily dissolve the organic compound at high temperature and precipitate the compound at low temperature.
What property of a particular solute towards a solvent is necessary for recrystallization to occur?
The coolness of the solution causes recrystallization. This is because the solute becomes solid at a higher temperature than the solvent.
Explain why crystallisation would not be suitable for purifying water?
An ideal crystallization solvent should be unreactive, inexpensive, and have low toxicity.It is also important that the solvent have relatively low boiling point as its best if the solvent readily evaporate from the solid once recovered.For most organic compounds, water is not a good recrystallization solvent.
What is a good solvent for recrystallization of sodium benzoate?
none at all. i tried everything.
What is the disadvantage of having excess solvent during recrystallization?
what is the disadvantage of having excess solvent during recrystalization
Which properties is consider during recrystallization process is?
The solubilties of the solutes are involved.
What impurity is removed during the recrystallization process?
Only those impurities can be removed which are soluble in solvent used.
Solvent for recrystallization?
A good solvent for recrystallization depends entirely on the polarity of the solid you're trying to purify. For example sodium chloride readily dissolves in water whereas naphthalene dissolves only in nonpolar solvents like hexane. To select a good solvent first consider the polarity of the compound of interest and pick a solvent that has the potential to dissolve it. Next suspend the solid in that solvent. You must pick another solvent if the solid completely dissolves in the selected solvent. Heat the mixture while stirring. If you reach the boiling point of the solvent and the compound hasn't dissolved, you must find a different solvent or add more of the solvent you are currently using. If your solid completely dissolves without too much of the chosen solvent, you have yourself a good solvent for recrystallization. To continue with the recrystallization simply allow the solvent to cool and your solid should precipitate out in the form of crystals. Put it in an ice bath to assist with the precipitation. The latter technique can lead to small crystals or powder. The best way to remedy this is to do a slow recrystallization. To do this you must use two solvents that will evaporate over a long period of time. One solvent must be very volatile and must be able to easily dissolve your compound at room temp. The other must be less volatile and your compound must be insoluble in this solvent. Note that this solvent must have the potential for dissolving the impurities in your compound. To perform the recrystallization, dissolve your compound in the "good" solvent and then add about the same amount of the "bad" solvent. Over a period of time, the "good" solvent should evaporate leaving your crystallized product in the "bad" solvent without any impurities.
What advantages does water has as a recrystallization solvent?
its cheap, has high temp range of 100 degrees, nonflammable, nontoxic
Explain why during the recrystallization of p-dibromobenzene the turbidity of the hot solution was used as an indicator for the ratio of ethanol to water used?
ethanol alone is not a good solvent for this substance recrystallization and the compound has a very low solubility in hot or cold water.so ethanol and water are mixed together as solvent for crystallization of p-dibromobenzene that is soluble in the hot solvent mixed.so the turbidity of the hot solution shows the good mixture of ethanol and water as solvent.
Why ethanol is the best solvent for recrystallization of urea?
because ethanol dissolve urea at slightly higher temperature and not dissolve the impurities
