Dissociation consts

Dissociation const, pKa 4.74 Suspended sediment/water 1.38E+04 ionic 8.817... 

Density, AGf, solubility, dissociation const, and standard potentials of oxidation-reduction reactions for aqueous species... 

For a compound with ionizable groups, its total solubility-, SB a function of the intrinsic solubility, Sb, and the difference between the molecule s dissociation const tgpd the solution pH. The intrinsic solubility is the solubility of the neutral molecular species. Fora weak acid,... 

Trans-tetrahydroxidodimethyl-stannate(IV) ion Raman and EMF studies four acid dissociation consts. of the aquo-dimethyltin(IV) ion 38... 

How do matters stand with radical addition A comparison of Ee0 and re with the energy of dissociation of the resulting bond De showed that this influence certainly does exist [41-46]. The parameters Ee0 and re are juxtaposed with the dissociation energy of the bond formed Z>e(X—C) in Table 6.21. For reactions of one class, namely, X + CH2=CHY, the linear correlation Ee0 = const x [De(X—C)]2 holds const = 5.95 x 10 4mol kJ 1. The following linear correlation was found to be fulfilled for the reactions of all the 13 classes considered (see Figure 6.6) ... 

Example The B E = const, linked scan [93] has been employed to quantify the caffeine content of coffee, black tea, and caffeinated cola softdrinks. [99] Caffeine, M" = 194, was determined by spiking the sample with a known concentration of [D3]caffeine, = 197, as internal standard. Both molecular ions dissociate to form a fragment ion at m/z 109 which was selected as m2. Then, the precursor ion scan showed either molecular ion, mi and [D3]mi, as precursor of the ion at m/z 109. The ratio of peak intensities was taken as a measure for the relative concentration of analyte and labeled standard (Fig. 4.29). 

The apparent activation energy of decomposition estimated from the Arrhenius plot for gave 120 kJ/mol. Conversely, Stander noticed that if the difference between the experimental dissociation pressures (e.g., 384 kPa) and the equilibrium (plateau) dissociation pressure corresponding to T = const (e.g., 404 kPa at T = 335°C for MgH ) is relatively small, then better fits were obtained with the model of random nucleation followed by one-dimensional growth or instantaneous nucleation followed by two-dimensional growth as given by the equation ... 

Ir, was found to be applicable only when dissociation of the end products is negligible. Temp distribution in the flame zone is calcd on the well-founded basis of const, enthalpy Ref R. Sandri, Can J chem 34,313-23 (1956)... 

Enfin, une etude recente a montre que Fon pouvait etablir une comparaison analogue aux precedentes a Faide des const-antes dissociation correspondant aux complexes donneur-accepteur de protons [19]. 

Si (p Ka)t et (p KJj sont les const-antes de dissociation de deux composes hydroxyles i et j, dans un solvant aocepteur A et si Avi et Avj sont les abaissements d la frequence de valence definis par la relation ... 

Type of Bond Dissociation Energy (kJ mol 1) Separation at potential minimum (pm) Force const. (N nr1). 

Note that CB-/CHB is proportional to Qih" because of the dissociation equilibrium HB + OH- — B- + H20 with KHB = CB-CH20/CHBC0H- = const, and CH20 = const.)... 

Note that if k2 ks (that is the equil. of E+S with ES is rapid compared to breakdown of ES to P), then M-M const = l/(affinity)= the dissociation constant, but only in these special conditions. ... 

The collapse occurs on the dynamical (free-fall) time scale tff 1/ /Up a fraction of second. Adiabaticity holds so the entropy per baryon s - S/kn const 1 and even can increase due to non-equilibrium beta-processes. Low specific entropy (compared to H-burning phase at the main sequence, s 10 — 15) prevents dissociation of nuclei until they touch each other at densities of the order of the nuclear density, pn 2 x 1014 g/cm3. The collapse stops (if the core mass is below some Mmax), and bounce of the shock occurs at 50 km from the center. 

The limiting current of the second wave (ij) is a diffusion current Curve 2 of Fig. 10 shows the relationship between this current and the equilibrium potential. In the range of high electron concentrations, this relationship can be expressed as Eq = const — (0.029 0.002) Ig i. The value of the proportionality constant 0.029 = 2.3 RT/nF, where n = 2 (see Eq. (8)), indicates that the electrode is in thermodynamic equilibrium with the electrons in solution, which are practically completely bound to form non-paramagnetic complexes containing two electrons. On decreasing the concentration of electrons, the slope of curve 2 is observed to increase (which means a decrease in the effective value of n). This happens due to partial dissociation of the associate. In Ref. 178 an increase in the height of the first... 

Fig. 4. Dissociation of the N-acetyllencyl ion P (m/z 156). A DADI/MIKE spectrum (uni-molecular process), B link scan B/E - const, (unimolecular process), C DADI/ MIKE spectrum (collisional activation), D linked scan B/E = const, (collisional activation)...

The possibility of equilibrium process of chemical bonds association-dissociation should be also exluded, since for this process the value does not exceed 2.03 [58]. After t 48 min in system neither chemical nor physical changes occur, that is reflected by the conditions Q = const and const. The poly condensation reaction realization rate 0 can be obtained from the Eq. (27), differentiating it by time t. This gives the expression [113] ... 

The dissociation N204 zN02 was studied by Playfair and Wanklyn, Deville and Troost, Naumann, 5 nd L. Natanson, E. Wourtzel, and Bodenstein, and the results were treated from the point of view of the law of mass action by Guldberg and Waage,J. Willard Gibbs, Schreber, and Scheffer. In this case the position of equilibrium depends on the volume V (or pressure) as well as on the temperature. If i g. mol. of N2O4 is taken and a fraction x is dissociated, x j i - )F=const. —K. 

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