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Separation Techniques In Daily Life

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by

Gideon Law

on 24 April 2013

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Transcript of Separation Techniques In Daily Life

BLACK INK COFFEE Mixture Of Ethanol
And Water Why Fractional Distillation
Should Be Used Why Gas Chromatography
Cannot Be Used Why Filtration Should Be Used Why Decantation Cannot Be Used As coffee powder is insoluble in water, the coffee particles will not be able to pass through the small pores of the filter paper. It will then be left behind as residue. Decantation will not work. This is because coffee particles are light and will remain suspended in the coffee solution. If
decantation is used, the coffee powder suspended in the mixture will also be
poured out together with the mixture. Therefore, filtration is a better choice compared to decantation. Why Paper Chromatography
Should Be Used The solvent which the filter paper is dipped in will separate the different pigments in the black ink. This allows us to identify and study the different components of a sample. This method relies on the different solubilities of the pigments in the ink. A pigment with a higher solubility in the solvent will move further up the filter paper. This method is very safe and few or even none hazardous risks are involved. Gas chromatography will not work because gas chromatography can only separate the different compounds of a gas and not a liquid. Separation Techniques
In Daily Life Why Simple Distillation
Cannot Be Used Ethanol boils at 78.4 °C while water
boils at 100 °C. So, by heating the
mixture, the more volatile component
will concentrate to a greater degree
in the vapour leaving the liquid. This
means that the fractionating column
used in fractional distillation will
condense the ethanol. The distillate
collected will be water. Simple distillation is often used when the different components in a mixture have a difference of 25°C or more in temperature of the boiling point. Ethanol and water have a difference of less than 25°C between their boiling points, meaning that both will evaporate and condense together if there is no fractionating column.
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