CHEM 1P00 Lecture 2: Chemistry Notes Lec 2
23 Jan 2017
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Freundlich adsorption equation for solutions x / m = kc1/n where, c is the equilibrium concentration. On taking logarithm of the above equation, we have langmuir adsorption isotherm. According to langmuir, the degree of adsorption is directly proportional to e, i. e. , the fraction of surface area occupied. x / m = k . These are plots of x / m us temperature t at constant pressure. For physical and chemical adsorption, they are shown below. These are the plot of temperature versus pressure for a given amount of adsorption. Applications of adsorption: for production of high vacuum, gas masks containing activated charcoal is used for breathing in coalmines. Catalyst is a chemical substance which can change the rate of reaction without being used up in that reaction and this process is known as catalysis. A catalyst may be positive (i. e. , increases rate of reaction) or negative (i. e. , decreases rate of reaction).
