By Jean Rouquerol, Visit Amazon's Françoise Rouquerol Page, search results, Learn about Author Central, Françoise Rouquerol, , Kenneth S.W. Sing
The declared goal of this ebook is to supply an introductory assessment of many of the theoretical and sensible points of adsorption by means of powders and porous solids with specific connection with fabrics of technological significance. the first target is to fulfill the wishes of scholars and non-specialists, who're new to floor technological know-how or who desire to use the complex ideas now on hand for the decision of floor sector, pore measurement and floor characterization. furthermore, a severe account is given of contemporary paintings at the adsorptive houses of activated carbons, oxides, clays and zeolites. Key beneficial properties * offers a accomplished therapy of adsorption at either the gas/solid interface and the liquid/solid interface * comprises chapters facing experimental technique and the translation of adsorption info acquired with porous oxides, carbons and zeolites * thoughts seize the significance of heterogeneous catalysis, chemical engineering and the construction of pigments, cements, agrochemicals, and prescription drugs
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Additional info for Adsorption by powders and porous solids: principles, methodology, and applications
From the midpoint of the first titration curve we can calculate the pKal (for the dissociation of carboxyl group) and from the mid-point of the second titration curve we can calculate the PKa2 (for the dissociation of the amino group). 12. TItration curve Jor alanine. PKaI isJora·COOH andpKa2 is for the a·NH; . 02 2 Thus. when we dissolve crystalline alanine in pure water. 02. 02. alanine will exist as a zwltterton. This pH is known as the isoionic point of alanine as alanine at this pH does not possess any net charge.
Let us consider a system of acetic acid and sodium acetate. From the discussion in the previous section we know that sodium acetate dissociates fully and acetic acid dissociates only a little. The solution therefore contains undissociated acetic acid molecules, CH 3COOH, acetate ions, CH3COO-, and Na+ ions. Let us now see what happens when an acid or a base is added to this solution. When an acid (HCl) is added: CH3COO- +H+ +CC ~CH3COOH+CC In solution HCI dissociates ccmpletely to produce hydrogen ions and chlOride ions.
02 ISOIONIC POINT There are many amino acids which have side chains containing dissociable groups. These groups might be acidic or basic in character. g.. aspartic acid. g. lysine). Their titration curves look like those ofpolyprotic acids. 14 respectively. Their isoionic points and different pKa are also shown in the figures. The student can thus write their dissociation sequence from the data provided in the figures ( the sequence would be much like that of alanine represented above). It may be mentioned.