Huckel constant

Hard wall Point ions (Debye-Huckel) Constant dielectric background... 

Coefficients cl-c4 are used to approximate the integral function "J" aphi is the Debye-Huckel constant at 25 C /... 

A apparent molality of acid (mole/kg of water) DEBYE - HUCKEL constant... 

Table 8.4 Debye-Huckel constants for H2O in T range 0 to 300 °C at saturation P (from Helgeson and Kirkham, 1974). A is in kg X mole and B is in kg X mole X cm. ...

A factor in Arrhenius equation Debye-Huckel constant activity... 

Table B.2. The Debye-Huckel constants used in the FREZCHEM model. T is temperature (K), and P is pressure (bars). (Numbers are in computer scientific notation, where e xx stands for 10 l )...

Equation 3 was obtained by combining the Nemst equation for the emf of Cell I with the equilibrium constant of the acidic dissociation of glycine. In Equations 2 and 3, E° is the standard emf of the cell in the respective solvent composition and these values were obtained from an earlier work (20). In Equation 4, /3 is the linear slope parameter for the plot of pK/ vs. I, a0 is the ion-size parameter, A and B are the Debye-Huckel constants on the molal scale (20) for the respective mixed solvent systems, and I is the ionic strength given by mi. 

Utilize the known values of the Debye-Huckel constants A and B for water to calculate the mean activity coefficients for 1 1, 1 2, and 2 2-valent electrolytes in water at the ionic strengths 0.1 and 0.01 at 25 °C. The mean distance of closest approach of the ions a may be taken as 300 pm in each case. (Constantinescu)... 

Evaluate the Debye-Huckel constants A and B for ethyl alcohol at 25 , taking the dielectric constant to be 24.3. 

Table 1.1 Debye-HUckel constant a in and the coefficients of the ionic strength terms for Af G° in kJ mol...

Aoh and are the Debye-Huckel constants (see section 3.8) and / is the ionic strength, z, is the charge on species i and the ion size parameter. If it is assumed that the individual values of a, can be replaced by an average value, d, and that is equal to za + Zb, then... 

Table B-2 Debye-HUckel constants as a function of temperature at a pressure of 1 bar below 100°C and at the steam saturated pressure for t > 100°C. The uncertainty in the A parameter is estimated in [2001LEM/FUG] to be +0.001 at 25°C, and 0.006 at 300°C, while for the B parameter the estimated uncertainty ranges from +0.0003 at 25°C to + 0.001 at300°C.

Theoretical value of the Debye Huckel constant, A is 0.509 at 25°C. So, the value obtained above from solubility measurements is very much below the theoretical value). 

For 0.005 m KfSO4 solution at 25° C. Calculated mean activity coefficient of electrolyte using Debye-Huckel limiting law (Debye Huckel constant A at 25° C is 0.509 kg1/2 moL1/2) ... 

Table 1. Debye-Huckel Constants for Various Temperatures...

Debye-HUckel constants as a function of temperature at a pressure of 1 bar below 100°C and at the steam saturated pressure for t > 100°C.365... 

Table B-2 Debye-Huckel constants as a function of temperature at a...

Standard EMF, Slope Factor and Debye-Huckel Constant A (Unit Weight of Solvent) as Functions of Temperature... 

Here k is the Debye-Huckel constant and x the distance to the interface which is estimated to be 3 nm [65] in the discussed system. There is a difference between bulk and interfacial concentrations in magnitudes, for example, bulk pH 3 and the interfacial pH 1.0 after 60 min at 298 K with 7.5 X 10 mol/m NaDdS (or pH 6.7 with DTACl) in a system of 1% acetic acid, 10% tri-n-octylamine in isododecane. This is similar for all ionic species involved according to the attraction/repulsion forces. 

As suggested by Pitzer, the dielectric constant used in calculating the Debye-Huckel constant is depended upon to reflect the effect of temperature on the activity coefficients. Either of the following methods may be used ... 

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