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Determination of the entropy of molten disodium polysulphides

✍ Scribed by V.S. Sharivker; S.K. Ratkje; B. Cleaver

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
335 KB
Volume
41
Category
Article
ISSN
0013-4686

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✦ Synopsis

The literature contains no reliable values for the entropy of molten sodium polysulphides. Na,S, (3 < x < 5). In this paper we show how these values can be derived from a knowledge of the activity of sulphur in equilibrium with each polysulphide, as a function of temperature.

The necessary information can be deduced from measured values of the em!, E, of the sodium-sulphur cell, and its temperature coefficient, (aE/dT), The entropy values obtained at 600K are: Na,S,,, (in equilibrium with pure liquid sulphur), 446JK-'mol-'; Na,S,, 434JK-'mol-'; Na,S,, 372JK-'mol-'; Na,S,. 308 J K-' mol-'.

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