過マンガン酸カリウムと銅板との反応に関する生徒実験への展開

抄録

The reaction of potassium permanganate as oxidizing agent and soluble reagent as reducing agent is practiced in an aqueous solution. The authors consider that it may be useful to find out the reaction of copper plates and potassium permanganate, even if the reaction of copper plates and potassium permanganate is equal to the reaction in an aqueous solution. In an acid solution, the black substance produced in the reacted solution of copper plates and permanganate ion was identified as manganese (IV) oxide by X-ray diffraction. The ratio of copper (II) ion/permanganate ion was 1.5 in a pH 5 solution, and nearly 2.0 in a pH 1–2 solution. It is suggested that permanganate ion changed to manganese (IV) oxide not as much as manganese (II) ion in the pH 1–2 solution, and permanganate ion changed to manganese (IV) oxide in the pH 5 solution. We attempted to develop a student experiment of potassium permanganate and copper plates.