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Why is crystallisation technique considered better than simple 2 evaporation to purify solids?
Wiki User
∙ 12y ago
because if you evaporate it the solids won't crystallise but will turn into a powder instead
Wiki User
∙ 12y ago
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How is crystallization technique better than simple evaporation technique to get a pure solid?
Crystallisation is the most common method to purify soluble solids. It is preferred over evaporation to dryness as many substances decompose upon strong heating. Also, when all the water is removed during evaporation, any soluble impurities will be left on the crystals (eg. sugar decomposes to become carbon when it is heated strongly). The shape and size of crystals can be controlled by controlling variables such as cooling rate and evaporation rate.In crystallisation, water is removed by heating the solution. Heating stops when a hot saturated* solution is formed. The resulting solution is left to cool and the dissolved solid will then be formed as pure crystals. This is because the solubility of the solute decreases as the temperature drops. At a lower temperature, less solute can be dissolved in the solution.
Does evaporation work better than coffee filters?
That would depend on what you are doing.
Why is crystallization better than evaporation for the separation of mixtures?
This affirmation is not generally valid.
How is crystallization better than evaporation?
Crystallization is better than evaporation in mainly two ways, : 1. in evaporation, the solution needs to be at the boiling point of the solvent, the whole time. This may degrade the solute. 2. in crystallization, the crystals automatically throw away impurities to arrange themselves in a regular manner. Therefore, the degree of purity is higher than the solute left after evaporation.
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my head
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