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Leclanché cell investigations I: Zn(NH3)2Cl2 solubility and the formation of ZnCl2·4Zn(OH)2·H2O

✍ Scribed by J. Larcin; W.C. Maskell; F.L. Tye

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
1007 KB
Volume
42
Category
Article
ISSN
0013-4686

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✦ Synopsis

The solubility of Zn(NHj)X12 in aqueous solutions containing ZnClz and NH4Cl at 298.15 K has been determined by pH titration with ZnO. In addition, the curve defining the critical concentrations of free ZnCl2 and free NHdCl which are in equilibrium at 298.15 K in aqueous solution with precipitates of both Zn(NH3hCl2 and ZnCl2.4Zn(OH)z.HzO has been determined for the first time by a new method involving potentiometric titrations using ZnO as titrant and zinc electrode potential as indicator. The new information has allowed the overall reactions which take place in three or four sequential stages during the discharge of a traditional Leclanche cell to be reviewed and significantly modified. The Gibbs free energies of formation of Zn(NH3)2C% and ZnClz.4Zn(OH)2.H20 at 298.15 K have been estimated respectively as -505,375 and -2,896,060 J mol-'.

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