What is an adsorption isotherm? Describe Freundlich adsorption isotherm.

Adsorption isotherm represents the variation of the mass of the gas adsorbed per gram of the adsorbent with pressure at constant temperature. Freundlich Adsorption isotherm: Freundlich gave an empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature. The relationship can be expressed by the following equation: x m = k . p 1 / n ( n > 1 ) where x is the mass of the gas adsorbed by mass ‘ m ’ of the adsorbent at pressure p , k and n are constants which depend on the nature of the adsorbent and the gas at a particular temperature. The relationship is generally represented in the form of a curve where mass of the gas adsorbed per gram by the adsorbent is plotted against pressure. These curves indicate that at a fixed pressure, there is a decrease in physical adsorption with increase in temperature. These curves always seem to approach saturation at high pressure. Taking log of above equation, we get log x m = log k + 1 n log p

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Chemistry 1>Chapter -1 - Surface Chemistry>Intext Questions>Q 5.5

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Why is the ester hydrolysis slow in the beginning and becomes faster after sometime?

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