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If you have a solution, you have a solute (usually a solid) dissolved in a solvent.
When you cool the solution, you increase the odds of the solute reassociating, thus forming solid crystals that you can then filter out to recover the product.
Wiki User
∙ 16y ago
Wiki User
∙ 14y agoI assume you are trying to recrystallize something. The substance you are trying to recrystallize is soluble when the solvent is hot but relatively insouble when the solution is cold. Ideally all impurities are either 1) soluble in both hot and cold solvent or 2) insoluble in hot or cold solvent. The soluble impurities will always remain in solution so you don't have to worry about it. The insoluble impurities can be filtered out. The reason the solution is kept hot during the filtration is to keep the target compound (the thing you are trying to recrystallize) in solution (remember, it is insoluble when the solution is cold so it will start to crystallize out of solution if it cools).
Wiki User
∙ 12y agoIm not sure what application you are using it for. But possibly to reduce soluability if the substance in the solvent is slightly soluable at a higher temp. Cooling it would force the substance out of solution so none wpuld be lost during filtration.
Wiki User
∙ 11y agoBecause some of the compounds will solidify and precipitate when the solution is not hot. As a result the compound will be collected as the solid residue instead of the liquid filtrate.
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Why must you keep the filter assembly hot while you remove the charcoal?
The filter assembly must remain hot when you remove the assembly or the solution contained within the assembly will crystallize to early.
Why a hot crystallization solution is not filtered unless absolutely necessary?
because the disired and undisired product might be at the same phase (liquid) and can both escape the filtration process into the container
Is hot chocolate a suspension a solution or a colloid?
solution
Why must a funnel be heated before hot acetanilide solution is heated and filtered?
Most likely so the glass will not crack as it expands as a result of being heated by a hot solution being poured into it.
What effect does the water temperature have on the solution rate?
if the temperature of the water is hot, then the sugars will dissolve faster because hot temperature increases solution rate.
Why is it necessary to filter the benzoic acid solution while hot?
At low temperature it has poor solubility and would crystallize out
Why is it necessary to filter the benzoic acid while hot?
because it will form solid when cool
Why must you keep the filter assembly hot while you remove the charcoal?
The filter assembly must remain hot when you remove the assembly or the solution contained within the assembly will crystallize to early.
How do you remove dried mice urine form kitchen dishes?
Wash them with hot water and soap. Soak for a while if necessary. Rinse in a bleach water solution.
How do you separate broken Glass water and salt?
You filter the mixture using a filter paper. By this the salt solution will get separated from glass bits. Then you take the salt solution and heat it. The water will get evaporated leaving salt behind.
How can insoluble particles can be removed from a hot solution?
Boil the solution. it works for salt water. If the particles are insoluble, you don't need to boil anything... just filter the solution using filter paper. (Salt water is soluble -- it is dissolved, but an insoluble particle is a solid in the liquid).
What type of solution is hot baking soda solution?
hot sodium bicarbonate
How do you separate sodium chloride sand and charcoal powder?
1. Put the mixture in a bottle containing hot water. 2. Stir vigourously. 3. Filter the mixture on filter paper, medium pores. 4. The charcoal powder remain on the filter, the salt in solution.
How often should one clean or replace a hot tub filter?
"This depends a lot on the filter and also on how often the hot tub is used. Again, while filters vary, most recommendations are to change the filter once every 6 months, more often if the tub is used heavily."
How insoluble particles can be removed from hot solution?
Insoluble particles can be removed from hot solution by filtration.
Can we use hot distilled water to dissolve KMnO4 properly when preparing solution?
Yes, you can, but it isn't necessary because KMnO4 is fairly soluble in room temperature water.
Why it is important to minimize the evaporation during the filtration of hot solution?
Because some of the compounds of the solution can disappear in the air by evaporation.To avoid recrystallization in the funnel. And rapid crystallization will occur if there is maximum evaporation.
