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Mass transport in supported zinc halide solutions—II. Complexation and migration effects

✍ Scribed by W.C. Hsie; J.R. Selman

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
948 KB
Volume
30
Category
Article
ISSN
0013-4686

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✦ Synopsis

Abstrnct-The speciation of ZnCl, solutions, with or without conduction electrolyte (KCl), is analyzed. The complex ZnCl; ion is the dominant zinc species in supported solutions. The complexation of zinc tends to cause a negative contribution to the limiting current in such solutions, since the migration flux of anionic species such as ZnCI; (or ZnCl:-) opposes the diffusional flux toward the cathode. Effective difIusivities of zinc, determined from limiting current measurements at a dropping mercury electrode, are corrected for this complex migration effect. The resultant corrected diffusivities are in good agreement with data reported in the literature for molecular diffusion of ZnClz in the presence of excess KCl, eg from capillary diffusion and interferometric measurements.

Method

Ref.

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