On the Electrode Potential of Zn Powder. (On the Reactivity of Zn Powder, 9th Report)

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  • 亜鉛末の電極電位について
  • アエンマツ ノ デンキョク デンイ ニ ツイテ

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Abstract

The relationship between the chemical reactivity, or the degree of crystal imperfection and the electrode potential of Zn powder has been studied. The potential difference between a high-purity standard Zn plate (99.99% up) annealed in vacuum and the sample Zn powder was measured potentiometrically both in Na2ZnO2 and ZnCl2 solutions. The distilled Zn powder (D-Zn) is nearly at the same potential as the standard Zn plate, while the electrolytic Zn powder (E-Zn) is the more negative than the standard Zn, the more pronounced the X-ray diffraction broadening in {103}. Exposure to air makes both E-Zn and D-Zn more positive than the standard Zn probably due to the formation of a basic carbonate film. Dissolution of the film brings back their former potential completely.

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