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Why the crystals are washed with water before recrystallization?
Wiki User
∙ 9y ago
For most compounds, but not all, hot water dissolves more than cold. If you make a hot, concentrated solution, as it cools, it cannot hold all of the solute, so solute comes out of solution as (hopefully) crystals. This produces small and imperfect crystals. To make very large and near perfect crystals, very pure and clean cold solutions are evaporated very slowly (although there are other, more complex ways to do this).
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoPure water (H2O) is very useful because it can hold molecules and when evaporated, would have nothing inside the jar, so its suitable for other chemicals additives so that crystallisation can occur, tap water has calcium and other minerals inside, which might be suitable but not essentially suitable, most times you would have to use a bottled source, which has more minerals than tap and can make crystals occur.
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Why the collected crystals in a recrystallization are washed with cold water rather than warm water?
Warm water would make your crystals go into solution again
If sugar was the main impuruty present in crude acetenilide would recrystalization from water be a good method of purification and why?
Yes. First we know acetneilide is soluble in water only when heated. We also know that sugar is soluble in water before and after heating. Therefore, when our sample cools, and recrystallization begins, the sugar should remain in solution, while the acetenilide crystallizes out. Therefore, when we wash our crystals, the sugar remains in solution and filters out.
Why lead chromate cannot be purified by recrystallization?
Lead chromate is insoluble in water.
Why is it that the sugar crystals disappear when stirred in water?
The sugar crystals have no added colour and are 'white' crystals in appearance. Once dissolved into the water, they create a transparent sugary solution. The same is for salt crystals that create a saline solution.
How are sea salt crystals made?
After the evaporation of water crystals are formed.
Why the collected crystals in a recrystallization are washed with cold water rather than warm water?
Warm water would make your crystals go into solution again
Why cant we use recrystallization to purify sulfuric acid and lithium?
Sulfuric acid doesn't form crystals; lithium react with water.
Why is sodium chloride not suitable for recrystallization?
The crystallization/recrystallization of sodium chloride from water solutions is frequently used.
What are the separation techniques for separating salt water from seawater?
Distillation can be used to separate water from salt water.
The alum crystals are washed of contaminations with am alcohol water mixture rather than deionized water?
Alum crystals are made of aluminum potassium sulfate, and are usually made by slowly dehydrating an aqueous solution of aluminum potassium sulfate. So, when you put water back onto a dried crystal, you will begin to dissolve it again.
When was Washed by the Water created?
Washed by the Water was created in 2007.
If sugar was the main impuruty present in crude acetenilide would recrystalization from water be a good method of purification and why?
Yes. First we know acetneilide is soluble in water only when heated. We also know that sugar is soluble in water before and after heating. Therefore, when our sample cools, and recrystallization begins, the sugar should remain in solution, while the acetenilide crystallizes out. Therefore, when we wash our crystals, the sugar remains in solution and filters out.
What is crystalllization?
The process of recrystallization relies on the property that for most compounds, as the temperature of a solvent increases, the solubility of the compound in that solvent also increases. For example, much more table sugar can be dissolved in very hot water (just below the boiling point) than in water at room temperature. What will happen if a concentrated solution of hot water and sugar is allowed to cool to room temperature? As the temperature of the solution decreases, the solubility of the sugar in the water also decreases, and the sugar molecules will begin to crystallize out of the solution. (This is how rock candy is made.) This is the basic process that goes on in the recrystallization of a solid.
Why lead chromate cannot be purified by recrystallization?
Lead chromate is insoluble in water.
Is benzhydrol suitable for recrystallization of bezhydrol?
Benzhydrol can be recrystallized, note that it is not water soluble.
How is rock salt purified?
1. The rock salt is grinded. 2. The grinded material is dissolved in water. 3. The liquid is filtered. 4. The solution containing sodium chloride is refinned by repeated processes of crystallization/recrystallization.
Why does hay need to be washed with water before given to a horse?
if it is dusty and/or your horse has an allergy than yes
