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What are the criteria in choosing a good recrystallization solvent?
Wiki User
∙ 13y ago
- 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.
Wiki User
∙ 13y ago
Wiki User
∙ 9y agothe choices
A)We should be able to easily remove the solvent from the purified product.
B) The solvent should have a high boiling point.
C) The solvent should dissolve a moderate quantity of the target substance near its boiling point but only a small quantity near 0 °C.
D) The crude compound should be soluble in this solvent at room temperature.
E) The solvent should not react with the target substance.
Wiki User
∙ 9y agoThe primary consideration in choosing a solvent for crystallizing a compound is the solubility. How flammable and toxic the solvent are also very important.
Wiki User
∙ 10y agoShould be able to dissolve your solid and should have a low boiling point. e.g. Ethanol is generally good. Reference your textbook for others.
Wiki User
∙ 6y agoThe solvent does not have to react with the solid, it is not toxic, corrosive, expensive and needs to evaporate quickly.
Anonymous
To perform recrystallization, an impure solid compound is mixed with hot solvent to form a saturated solution.
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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 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.
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.
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 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.
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truthful funny smart athletic caring nice good looking and one who likes me for being me!
How made nacl?
A good method of refining NaCl is repeated crystallization/recrystallization.
What qualifications should I look for when choosing doctors for Lap Band surgery?
There are a lot of criteria to keep in mind. Here is a good guide http://www.lapband.obeseinfo.com/bariatric-surgeons-dallas.htm
How made pure salt?
A good method of refining NaCl is repeated crystallization/recrystallization.
What experimental technique would you use choose a suitable solvent?
In choosing solvent i would consider the following factors: What are the solutes? - are they polar or nonpolar how should they be dissolved What is the next step? - E.G. Do you need to distil or heat, then boiling point would be important. Is the solvent inert? Obviously side reactions are bad so choose a solvent which will not react. Good solvents are ethyl ether or ethyl alcohol.
