Entropy, absolute molal

The coefficients a, and b are dependent on temperature and the type of ion (cations, OH- and simple anions, oxyanions and acid oxyanions) and have been established by Criss and Cobble by analyzing available experimental data. SiggCabsolute) is the 298°K entropy on an absolute sca e corresponding to the partial molal entropy of H (aq) as -5.0 cal deg" mole-1 at 298°K. The absolute and conventional partial molal entropy for any ion are related by... 

Nearly all current attempts to divide partial molal entropies of electrolytes in organic solvents into their ionic components have required a knowledge of the absolute entropy of the corresponding ions in water. Consequently, it appears worthwhile to examine some of the methods which have been used to evaluate absolute values in this solvent. 

Standard Absolute Ionic Entropies (cal mol" K ) at 25 C (Hypothetical 1 Molal Standard State) ... 

The partial molal entropies of hydrogen ion and some other hydrated ions on the absolute scale... 

Table 3. The partial molal entropies for some hydrated ions on the conventional scale and on absolute scale (J.K-i.mol-i).

P = vapor pressure p = partial pressure R = gas law constant aB = partial molal change in entropy ASe = excess partial molal entropy change T = absolute temperature... 

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