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ORNL-1816 - the Molten Salt Energy Technologies Web Site

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Subsequent reports will be concerned with some<br />

quantitative aspects of subjects treated qual itatively<br />

in this report, and with Equilibria II and Ill,<br />

and, hence, with oxidation-reduc<br />

including mass transfer.<br />

A large percentage<br />

liquid systems can be classified as acid-base analog<br />

reactions or as on-reduction reactions, In<br />

most systems t re of <strong>the</strong> solvent controls<br />

<strong>the</strong> acid-base analog reaction, while in oxidationreduction<br />

reactions <strong>the</strong> solvent usually plays a<br />

minor role. On <strong>the</strong> o<strong>the</strong>r hand, oxidation-reduction<br />

reactions in fused hydroxides are related to acidbase<br />

equilibria in at least three ways, First, acidbase<br />

reactions depend on Equilibrium I and oxidation-reduction<br />

reactions depend on Equilibrium II,<br />

Equilibrium Ill. Second,<br />

ent can stabilize higher<br />

Is through solvolytic reaction.<br />

Third, in some cases <strong>the</strong> kinetics of <strong>the</strong><br />

hydrogen replacement reaction in fused sodium hydroxide<br />

appears to be dependent on acid-base equilibria<br />

in a way analogous to similar replacement<br />

reactions in liquid ammonia, Thus, a study of<br />

acid-base equilibria in fused hydroxides is a necessary<br />

prelude to a more interesting study of <strong>the</strong><br />

oxidation-reduction reactions whic<br />

in <strong>the</strong> corrosion<br />

In order to foc<br />

acid-base analog reactions, only Equilibrium I will<br />

This treatment is valid at lower<br />

in <strong>the</strong> absence of strong oxidizing<br />

or reducing - agents, -<br />

PERIOD ENDING DECEMBER 70,1954<br />

This “inert” behavior of <strong>the</strong> cations in ac:id-base<br />

processes stems from tw actors: first, <strong>the</strong> large<br />

ionic radius and small charge of <strong>the</strong> cations and,<br />

second, <strong>the</strong> exceptionally small ionization energy<br />

of <strong>the</strong> parent atoms.<br />

Solvent-System Concept. In terms of <strong>the</strong> solvent-<br />

system concept first introduced by Franklin7 for<br />

liquid ammonia and subsequently applied by<br />

Jander8 to a variety of liquids, it is clear that<br />

Eq. 2 fulfills <strong>the</strong> formal requirements for CI water-<br />

like acid-base equilibrium and, hence, that <strong>the</strong><br />

fused alkali-metal hydroxides may be properly<br />

considered as acid-base solvent systems.<br />

The remainder of this report is concerned with<br />

a determination of <strong>the</strong> types of reaction

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