Acid dissociation exponent

Appendixes Tables of solubility products, acid dissociation constants (updated to 2001 values), redox potentials, and formation constants appear at the back of the book. You will also find discussions of logarithms and exponents, equations of a straight line, propagation of error, balancing redox equations, normality, and analytical standards. 

If the carboxyl groups are all linked in the same way in the macromolecule and are situated so far apart that their interaction can be neglected, the titration curves ought to be identical with those of a monobasic weak acid. This appears however not to be the case. If one determines the dissociation exponent pK at various points of the curve... 

In Equations [7.2] and [7.3], and are rates for the non-catalytic hydrolysis and auto-catalytic hydrolysis reactions, respectively, a and P are related to the production rate of the small molecules by chain scission, m is the average degree of polymerisation of the small molecules, and n is the exponent for acid dissociation, which is usually taken as 0.5. D is the diffusion coefQcient of the small molecules in a degrading polymer, which is calculated by... 

The values of Ka and Kb for different acids and bases vary through many powers of ten. It is often convenient to use the dissociation constant exponent pK defined by... 

The rate-enhancing effect of cationic detergents was analyzed by using Hill s equation. The observed exponent (n = 3 — 4) suggests that polymer-bound detergents facilitate the subsequent binding acceleratively hence the sigmoidshaped dissociation behavior of hydroxamic acid. 

TABLE LVII. DISSOCIATION CONSTANT EXPONENTS OP ACIDS AND BASES AT 25 ... 

The dissociation constant exponents at 25 of a number of physiologically important amino-acids are recorded in Table LXXV those... 

For determination of the catalytic activity of an acid of known strength from equation 11, it is only necessary to know the value of the exponent x, the catalytic activity kA, and the dissociation constant Ka of a reference acid HA of the same type as HA. Thus,... 

As an illustration, Table I shows data for the base-catalyzed halogenation of a number of ketones and similar substances. In this table, R is the catalytic constant (in liters/mole/minute) of the anion of a hypothetical acid of dissociation constant 10-4 obtained by interpolating data for carboxylate anions. In computing R a statistical correction has been made for the number of equivalent hydrogen atoms in the substrate, counting as independent atoms attached to the same carbon. /3 is the exponent in Eq. (51). 

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