In performing a hot filtration at the miniscale level, what might happen if the filter funnel
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In performing a hot filtration at the miniscale level, what might happen if the filter funnel is not preheated before the solution is poured through it? |
Explanation
Hot filtration is a purification method often used in crystallization or recrystallization procedures. The principle of this method lies upon the differences in solubility of solutes in a solvent at varying temperatures. More specifically, the desired solute must be soluble in the solvent at high temperatures and sparingly soluble at low temperatures for the successful recovery of the solid.
Notably, a very important factor that can contribute to the purity of crystals is the cooling rate. A slower cooling rate allows impurities to return to the solution for effective separation; hence, crystal purity and cooling rate are inversely related. This implies that a slower cooling rate would yield crystals of higher purity. For this reason, the funnel during hot filtration is heated prior to the filtration of the boiled solution. Otherwise, premature crystal development may occur on the filter paper or in the funnel stem which are of less purity as a result of a fast cooling rate. Additionally, this will also clog the set-up and hamper filtration, leading to a low yield of pure crystals.
Answer
During hot filtration, the funnel is heated prior to the filtration of the boiled solution. Otherwise, premature crystal development may occur on the filter paper or in the funnel stem which are of less purity. Additionally, this will clog the set-up and hamper filtration, leading to a low yield of pure crystals.
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