過酸化水素水と塩酸との混合水溶液中における銅板上での周期的変化の観察条件

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タイトル別名
  • Conditions for Observing Periodical Change on Copper Plates in a Mixed Solution of Hydrochloric Acid and Hydrogen Peroxide
  • カサンカスイソスイ ト エンサン ト ノ コンゴウ スイヨウエキ チュウ ニ オケル ドウバン ジョウ デ ノ シュウキテキ ヘンカ ノ カンサツ ジョウケン

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説明

In the case of the reaction of a metal plate and reagent in a solution, attention was given to ions and molecules in the learning of oxidation and reduction in senior high school, while the surface state of the metal plate was hardly noticed. The author reported that the surface was blackened by the reaction of a copper plate with a thermal-concentrated sulfuric acid or with concentrated nitric acid. Copper is not dissolved in hydrochloric acid alone, but it was dissolved easily in hydrochloric acid with the addition of hydrogen peroxide. In viewing the surface of the copper, the author found that the white color periodically appeared on the surface of the copper plate in the mixed solution of hydrochloric acid and hydrogen peroxide. The purpose of this study is to clarify the condition for observing the periodical change. It showed that the white material was identified to be copper (I) chloride, and that it changed and dissolved into a green copper (II) chloride. Learning about oxidation at senior high school will be made more interesting by observing whitened copper plates of thin composition in a concentration of the mixed solution of hydrochloric acid and hydrogen peroxide periodically and dramatically.

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  • 科学教育研究

    科学教育研究 37 (3), 208-214, 2013

    一般社団法人 日本科学教育学会

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