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Why should the recrystallization solvent have a fairly low boiling point?
Wiki User
∙ 12y ago
the more solvent you use the more of the poorly soluable compound (wich you are trying to crystallise) will be lost when you cool down your solvent.
because the soluability at the lower temperature is still not 0 g/l.
Wiki User
∙ 16y ago
Wiki User
∙ 13y agoChoosing the proper solvent is very important in recrystallization because it will help us to increase our yield. If we will use inappropriate solvent, the recrystallization process perhaps will not be that successful.
Wiki User
∙ 11y agowhen both the product and impurity are dissolved in the first solvent and you want to separate the impurity from the product you can add a second solvent (immiscible with the other solvent) in which only the product (or only the impurity) is soluble in. This way you can easily separate the impurity from the product.
So the circumstance is when you want to have impurities in solution and want to separate them out.
Wiki User
∙ 13y agowhen both the product and impurity are dissolved in the first solvent and you want to separate the impurity from the product you can add a second solvent (immiscible with the other solvent) in which only the product (or only the impurity) is soluble in. This way you can easily separate the impurity from the product.
So the circumstance is when you want to have impurities in solution and want to separate them out.
Wiki User
∙ 9y agoWater is considered as a suitable solve for recrystallization. This is due to the polarity of water which allows it to dissolve the solute when the solution is hot, but not when the solution is cold.
Wiki User
∙ 12y agobecause the compand acutally dissolves not melt in the hot solvent
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The more-abundant substance in a solution?
in any solution the substanse with the greatest quanity is the
What is the solute and solvent in a copper sulfate solution?
The copper sulfate is the solute and water is the solvent.
Is the melting point for methanol higher than silicon?
Since at normal room temperature methanol is a liquid and silicon is a solid, it should be fairly obvious that the answer is "no."
What is the boiling point celsius?
Generally this question is asked in reference to water (which is ~100 degrees Celsius) It should be pointed out that the fact that water boils at 100 degrees Celsius and freezes at 0 degrees Celsius at one atmosphere pressure (760 mm Hg) is not a fluke. It was purposely scaled to to water. In general the boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure acting on the liquid. On Earth in the open air the boiling point of a liquid depends on atmospheric pressure. As a consequence the boiling point becomes lower as the external pressure is reduced - as when you go to the peak of a mountain.
What happens when heat is added to boiling water?
Depending on how much heat you add, more and more water will evaporate. It should be noted that the temperature will notincrease, however. The temperature of the water will stay the same until all the water has changed state and become steam, or water vapor, if you prefer.
What are the criteria in choosing a good recrystallization solvent?
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 impuritiesHave 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.
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 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 are the properties of an ideal recrystallization solvent?
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
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 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.
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most vitamins should be taken with a meal and a solvent...it does not mater if the solvent is water, juice or milk
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When the liquid is boiling steadily and the temperature has stabilised.
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question itself is wrong, chloroform is solute and ccl4 is solvent, solute should dissolve in solvent and solvent cannot dissolve in solute
How do you make a sentence out of solvent?
Always test the solvent on a small hidden place on the garment before applying it to the stain. A man who is not financially solvent should not ask a woman to marry him.
Does hexane dissolve 1-octanol?
It should dissolve it fairly well, yes. Despite the hydroxyl group, octanol is still a lipophilic molecule so you'll get much better dissolution in a non-polar organic solvent than a polar one.
Should men and women be treated equally?
Yes, men and women should be treated fairly. Girls should be treated fairly as boys are.
