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Two or more miscible liquids having different boling points can be separated by fractional distillation method. T
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In a homogeneous mixture, fractional distillation is suitable for separation of 2 or more miscible liquids with different boiling points. When the components have a boiling point difference of about 25K (25°C) or less among them, they will vaporise at different rates and thus can be separated.

For example, upon fractional distillation of a mixture of water and ethano, ethanol boils at 78.4 °C, while water boils at 100 °C. So, by heating the mixture, the most volatile component (ethanol) will concentrate to a greater degree in the vapour leaving the liquid (majorly water).

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Two or more miscible liquid whaich have boiling point difference 25 degree celsius can be separated by fractional distillation. For example. Crude oil It is mixture of petrol, diesel, kerosene and other petrochemicals.

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