Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Viscosity of liquid components is very high
One of the liquid components has very high affinity towards the solvent
Extracting solvent is cheaply & abundantly available
One of the liquid components is heat sensitive

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Mass Transfer
Henry's law states that the

Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
Partial pressure is equal to the product of the mole fraction and total pressure
Vapour pressure is equal to the product of the mole fraction and total pressure
Partial pressure of a component over a solution is proportional to its mole fraction in the liquid

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