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if it wouldn't be above the level of solvent the spots will run off

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Q: Why must the level ofthe solvent not reach the pencil line where the spots are?
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Why must the level of the solvent not reach the pencil line where the spots are?

because the colours would mix together, making the results unreliable


Does water dissolve and transport substances?

Yes. Water is the best solvent known. Given enough time water will dissolve anything. Water seeks its own level and will travel downhill until it settles at the lowest spot it can reach.


When a solvent is holding the maximum amount of solute for that given temperature?

A saturated solution


According to the rules of osmosis a system will reach a state of equilibrium when there are equal numbers of molecules on both sides of a water-permeable membrane.?

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.

Related questions

Why must the level of the solvent not reach the pencil line where the spots are?

because the colours would mix together, making the results unreliable


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What is the greatest amount of solute that a solvent can dissolve?

A solvent will only dissolve enough solute to reach its saturation point. Exact quantities are defined by the nature of the specific solvent ant solute, and the prevailing environmental conditions.


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Does water dissolve and transport substances?

Yes. Water is the best solvent known. Given enough time water will dissolve anything. Water seeks its own level and will travel downhill until it settles at the lowest spot it can reach.


When a solvent is holding the maximum amount of solute for that given temperature?

A saturated solution


What is the maximum amount of solute that can be dissolved in a solute at a particular temperature?

This is known as the solubility of the solute in the solvent. When you reach the maximum it is know as the saturation concentration. Adding any more solute will not dissolve in the solvent.


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