Molar conductivity tabulated

It is used for calculating the limiting molar conductivity, JsP, of an electrolyte from tabulated individual limiting ionic conductivities, X°, i.e. for very, very low concentrations. Under such conditions, the law can handle calculations of predicted limiting molar conductivities for both strong and weak electrolytes. 

Students should be warned that many investigators tabulate individual molar conductivities in the form of for V2 Ca " ", for ALa " and so forth, i.e. they would give A for A Ca as... 

These are both very fundamental quantities in the study of electrolyte solutions. Transport numbers are necessary for the subdivision of molar conductivities into the individual ionic contributions. Because they can be studied over arange of concentrations this allows tabulated data to be drawn up for ionic conductivities for a wide variety of ions over a range of concentrations. This is important in itself, but is also useful when comparing theory with experiment. 

The limiting ionic conductivity is a transport property of an ion, which does not depend on concentration but depends on tanperature and pressure (or density of the solvent). Contrary to any tliamodynamic property of an individual ion, the limiting ionic conductivities of individual ions can experimentally be obtained and are tabulated in [Chapter 10, Table 10.12] for a number of anions and cations. Therefore, the molar conductivity of an electrolyte at infinite dilution. A , is an additive value and can be calculated using the limiting ionic conductivities. This possibility is particularly useful for the weak electrolytes, whai A cannot be experimentally obtained using Kohlrausch s law by an extrapolation to the infinite dilution. For example, the limiting molar conductivity of acetic add, CHjCOOHCaq), can be calculated as follows ... 

Thermal Conductivity and Thermal Expansion. Thermal conductivity of liquids (and gases to some extent) is still an empirical subject in any but the broadest sense. Kowalczyk (1144) reviewed the subject and the equations which relate thermal conductivity to viscosity, molar volume, melting point, and sound conductivity. Sakiadis and Goates (1776, 1777) tabulate values for a number of compounds and present correlation functions for thermal and sound conduction. 

Values of limiting molar ionic conductivities for a few common ions are shown in Table 1. The data tabulated are referred to 25°C temperature. The term limiting molar ionic conductivity is used according to lU-PAC recommendation, rather than the formerly used limiting ionic equivalent conductivity. The molar and equivalent values are interconvertible through stoichiometric coefficient z. 

These tables give thermodynamic and transport properties of some important fluids, as generated from the equations of state presented in the references below. The properties tabulated are density (p), energy (E), enthalpy (H), entropy (S), isochoric heat capacity (CJ, isobaric heat capacity (CJ, speed of sound (v ), viscosity (q), thermal conductivity (X), and dielectric constant (D). All extensive properties are given on a molar basis. Not all properties are included for every substance. The references should be consulted for information on the uncertainties and the reference states for E, H, and S. 

Tabulated are the equivalent conductances, transference numbers, activity coefficients, densities and partial molar volumes, apparent molar compressibilities, heats of solution and dilution for the rare earth salts in aqueous solution at 25 "C. 

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