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| Mercury beating heart ： ウィキペディア英語版 |
Mercury beating heart
The mercury beating heart is an electrochemical redox reaction between the elements mercury, iron and chromium. The reaction causes a blob of mercury in water to oscillate.
The observeable reaction demonstrates an effect of a non-homogeneous electrical double layer.〔Mercury Beating Heart: Modifications to the Classical Demonstration Najdoski, Metodija; Mirceski, Valentin; Petruševski, Vladimir M.; Demiri, Sani. J. Chem. Educ. 2007, 84, 1292. (Abstract )〕 It is often used as a classroom demonstration.
==The experiment==
In the experiment a droplet of mercury is placed in a watch glass, immersed in an electrolyte such as sulfuric acid which contains an oxidizing agent such as hydrogen peroxide, potassium permanganate, or potassium dichromate. The tip of an iron nail is positioned almost touching the mercury. If the position of the nail tip is just right, the mercury blob begins to oscillate, changing shape.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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