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17 Questions around this concept.
0.27 g of a long chain fatty acid was dissolved in 100 cm3 of hexane. 10 mL of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is 10 cm. What is the height of the monolayer (in m)?
$$
\text { [Density of fatty acid }=0.9 \mathrm{~g} \mathrm{~cm}^{-3}, \pi=3 \text { ] }
$$
0.47 g of long chain fatty acid was dissolved in $100 \mathrm{~cm}^3$ of haxone, Hexane evaporates a monolayer is formed when 10 ml of this solution was added dropwise to the surface of water in round watch glass . The distance from edge to router of the watch glass is 10 cm . What is height of monolayer {Density of fatty acid $0.9 \mathrm{~g} \mathrm{~cm}^3 \pi=3$}
Match List I with List II
List I | List II | ||
A. | Physisorption | I. | Single Layer Adsorption |
B. | Chemisorption | II. | $20-40 \mathrm{~kJ} \mathrm{~mol}^{-1}$ |
C. | $\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g}) \xrightarrow{\mathrm{Fe}(\mathrm{s})} 2 \mathrm{NH}_3(\mathrm{~g})$ | III. | Chromatography |
D. | Analytical Application or Adsorption | IV. | Heterogeneous catalysis |
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Pt and Pd absorb large volume of hydrogen under specific condition .The hydrogen so adsorbed is called
Now as you know about Freundlich isotherm, let us discuss one of the important application of this isotherm in adsorption from solution phase
Solids can adsorb solutes from solutions also. When a solution of acetic acid in water is shaken with charcoal, a part of the acid is adsorbed by the charcoal and the concentration of the acid decreases in the solution.
The precise mechanism of adsorption from solution is not known. Freundlich’s equation approximately describes the behavior of adsorption from solution with a difference that instead of pressure, concentration of the solution is taken into account, i.e.,
(C is the equilibrium concentration, i.e., when adsorption is complete).
Let us discuss about the various applications of adsorption.
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