Using a new type of electrode, MHDE, copper electrodeposition from acidic copper sulfate solution was examined. Resultantly, remarkable hysteresis effect of the magnetic field on reaction rate emerged, accompanied with drastic decrease of the reaction activity. To clarify this phenomenon, another experiment, i.e., copper dissolution in nitric acid was carried out. The results obtained exhibited the quite curious facts that in concentrated nitric acid, the dissolution process is almost blocked by magnetic field, whereas dilute nitric acid, on the contrary, makes acceleration of the dissolution.
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