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Why is water a good solvent for the recrystallization of acetanilide?
Joohwangee
Water is a good solvent for the recrystallization of acetanilide only at high temperatures. This process does not work at low temperature water. At high temperatures this is a good solvent because its polarity is neutral and the molecules are rapidly moving around.
Wiki User
∙ 10y ago
Wiki User
∙ 14y agoRecrystallization is a purification process used to remove impurities from organic compounds that are solid at room temperature. the process is based on the premises that that the solubility of a compound in a solvent increases with temperature. the solubility of the compound decreases as the solution cools& crystals form. an appropriate solvent is that in which acetanilide is soluble at high temperatures & insoluble in cold solvent. acetanilide itself is nonpolar therefore best soluble in nonpolar solvents. ethanol on the other hand is polar. therefore ethanol when singly used is not a good solvent.
the 4 major criteria 4 selecting recrystallizing solvent:
1. compound being purified must be insoluble in solvent at room temperature
2.compound must be soluble in boiling solvent
3.solvent's b.p must be lower than the compound's m.p
4 abundant quality of crystals must be recoverable from the cool solvent.
Wiki User
∙ 15y agoAt high temps, acetinalide dissolves in water readily but is not very soluble at low temps.
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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.
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 part of air is the solvent and why?
Water vapor would be the solvent. Water alone is a good solvent.
What would be a good solvent at room temperature for naphthalene C10H8 Water ethanol or pentane?
pentane will be good solvent for naphthalene.
How can water dissolve ionic compounds and covelent compounds?
Water is a good solvent because it has polar -O-H groups and the same reason makes water a good solvent for polar compounds as acetic acid and hydrochloric acid. Water is not a good solvent for non polar compounds such as bromine and iodine.
Why is water a good solvent for the crystallization for acetanilide?
It is most useful when crystals are being filtered out of a desired product. Why is water a good solvent for the recrystallization of acetanilide? Acetanilide readily dissolves in hot water, but is insoluble at low temps. Thus, it dissolves in hot water but crystalizes easily when cool.
What is a good solvent for recrystallization of sodium benzoate?
none at all. i tried everything.
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.
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.
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 part of air is the solvent and why?
Water vapor would be the solvent. Water alone is a good solvent.
What is universal solvent?
A universal solvent doesn't exist; water is a good solvent for many materials.
What is the universal solvent?
A universal solvent doesn't exist; water is a good solvent for many materials.
Water is not a good solvent for re-crystallization because?
It is a non volatile solvent.
Is water a good solvent for many substanes?
Yes it's the universal solvent
An important property of water is that?
its a good solvent
How water is known as universal solvent eventhough it doesnt dissolve all substances?
Water is a very good and known solvent but it is not an universal solvent. An universal solvent doesn't exist and is absolutely impossible to obtain an universal solvent.
