write a short note about fredulich's adsorption.
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Adsorption Isotherm is a curve that expresses the variation in the amount of gas adsorbed by the adsorbent with pressure at constant temperature.
In 1909, German scientist Freundlich provided an empirical relationship between the amount of gas adsorbed by a unit mass of solid adsorbent and pressure at a particular temperature. It is expressed using the following equation –
x/m = k.P^1/n (n > 1)
where ‘x’ is the mass of the gas adsorbed on mass ‘m’ of the adsorbent at pressure ‘P’. ‘k’ and ‘n’ are constants that depend on the nature of the adsorbent and the gas at a particular temperature.
Limitations of Freundlich Isotherm
Freundlich isotherm only approximately explains the behaviour of adsorption. The value of 1/n can be between 0 and 1, therefore the equation holds good only over a limited range of pressure.
When 1/n = 0, x/m is constant, the adsorption is independent of pressure.
When 1/n =1, x/m = k P, i.e. x/m ∝ P, adsorption is directly proportional to pressure.
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Answer:
In 1909, Herbert Freundlich gave an expression representing the isothermal variation of adsorption of a quantity of gas absorbed by unit mass of solid adsorbent with pressure. This equation is known as Freundlich adsorption isotherm or fruendlich adsorption equation.