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A study of Ga3+ Reduction in the drop mercury electrode

✍ Scribed by Vicente Almagro; María Jesús Peña; Juan Sancho

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
425 KB
Volume
21
Category
Article
ISSN
0013-4686

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✦ Synopsis

A kinetic study is carried out of the Ga'+ + 3e +Ga electrode reaction in relation to the existing ionic species in the media used: LiClO&, NaCI, KBr, NaNOa, N&O, and NH,OH. It is found that the predominant species in equilibrium at the electrode have a coordination index of 6 ligands for the SO;, the Cl-and NO; ions, 5 for Br-and 4 for NH,. It is also noted that Ga"' does not form complex compounds with ClO; ions. The specific rate constant of electrode reaction in the equilibrium potential, k, calculated by Koutecky's method, is in all cases between 2.10-> and 1 .lOm" cm se', and the transfer coefficient, a, is about 0.15.

By microcoulometric methods it is confirmed that the number of electrons in the electron transfer is three.

A study is also made of the interaction of the Ga" reduction wave, which in a 0.1 M LiCIO, medium presents a half wave potential (E,,,) of -1,270V with reference to see, with the H' wave. It is concluded that the optimum pH of study is between 2.7 and 3.1. The ionic intensity of the medium is also taken into account.

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