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- Dissolve the entire compound at the boiling point of the solvent.
- Dissolve very little or none of the compound when the solvent is at room temperature.
- Have different solubilities for the compound and the impurities
- Have a boiling point below the melting point of the compound so that the compound actually dissolves, not melts, in the hot solvent.
- Have a relatively low boiling point.
What else can I help you with?
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 solutes dissolve in turpentine?
Turpentine is a good solvent for paints.
Water is a poor solvent?
This question demands a comparison - poor with regard to what?. Water is a good solvent compared with carbon dioxide. Water is a poor solvent compared with nitric acid.
What is a good sentence for the word connoisseur?
A plagiarist would be a connoisseur of choosing the best "good sentences" from the Internet.
How does something dissolve faster?
When substances is are put into solution the molecules of both the solvent and the solute are interspersed. Heating the solvent will cause it's molecules to move faster and thus allow the molecules of the solute to better access the spaces between them. Stirring and shaking also speeds up dissolving.
What are the characteristics that identify a good recrystallization solvent?
A good recrystallization solvent should have the following characteristics: high solubility for the compound being purified at high temperatures, low solubility at low temperatures to allow for crystal formation, non-reactive with the compound, and easily removable from the crystals after recrystallization.
Is Chloroform a good solvent for recrystallization in acetanilide?
Chloroform is not a commonly used solvent for recrystallization of acetanilide. It is more commonly used for dissolving non-polar or slightly polar compounds. In the case of acetanilide, solvents such as ethanol or ethyl acetate are often preferred for recrystallization.
What is a good solvent for recrystallization of sodium benzoate?
A good solvent for recrystallization of sodium benzoate is water, as sodium benzoate is highly soluble in water. Additionally, ethanol can also be used as a co-solvent to enhance solubility and increase the purity of the recrystallized product.
Why is water a good solvent for the recrystallization of acetanilide?
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.
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?
Ethanol is a good solvent for recrystallization of urea because it has the ability to dissolve urea at higher temperatures and allows for selective precipitation at lower temperatures, resulting in purer crystals. Additionally, ethanol is a relatively non-toxic solvent and is readily available, making it a practical choice for recrystallization processes.
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.
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 were the criteria in choosing our Philippine national hero?
the criteria in choosing our national hero are the following: * must be a Filipino citizen * displayed unconditional love for the country * done something good or for the benefit of the country * must be loyal and a patriot
Why ethanol is used in recrystallization of benzanilide?
Ethanol is often used in the recrystallization of benzanilide because it is a good solvent for benzanilide at high temperatures. When the mixture is cooled, benzanilide becomes less soluble in ethanol, leading to the formation of pure crystals as it precipitates out of the solution. Ethanol also helps to minimize impurities in the final crystal structure of benzanilide.
Why water is not a good solvent for the recrystallisation. Explain this statement.?
Water is not always a good solvent for recrystallization because it can dissolve a wide range of substances, including many impurities, at elevated temperatures, which can complicate the purification process. Additionally, if a compound is highly soluble in water, it may not crystallize effectively upon cooling, leading to poor yield. Moreover, water can also facilitate the formation of hydrates, which may alter the properties of the desired product. For optimal recrystallization, a solvent that selectively dissolves the target compound while leaving impurities behind is preferred.
Why is water a poor solvent for the recrystallisation of iodine?
Water is a poor solvent for the recrystallization of iodine because iodine is only slightly soluble in water. As a nonpolar solvent, water cannot effectively dissolve the polar iodine molecules, resulting in low solubility and poor recrystallization efficiency. Other solvents, such as ethanol or acetone, are more suitable for recrystallizing iodine due to their ability to dissolve iodine more effectively.
