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How does a different color of precipitate?
According to the law of electrolysis of the English physicist Faraday, the mass of substances released on the electrode is directly proportional to the amount of electricity passed through the electrolyte. Thus, water staining is caused by dissolution of the electrode. The color of the precipitate depends on the material of the electrode. And the intensity of staining depends on the total salinity of the water (salt concentration) and the duration of the electric current.
Consider three types of electrodes for the described experiment - steel, aluminum, copper. During electrolysis with iron electrodes, the anode immediately begins to dissolve with the formation of black-green flakes of ferrous hydroxide. This stratification is obtained in a couple of minutes of operation at a good direct current. Over time, iron hydroxide changes color from green to reddish-brown. A mixture of white-gray oxide / aluminum hydroxide is observed from the destroyed aluminum anode. Copper ions form mainly a brown precipitate, over time which also changes color to lighter.
Accordingly, the bulk of the substances obtained are the products of the destruction of the anode.
According to the law of electrolysis of the English physicist Faraday, the mass of substances released on the electrode is directly proportional to the amount of electricity passed through the electrolyte. Thus, water staining is caused by dissolution of the electrode. The color of the precipitate depends on the material of the electrode. And the intensity of staining depends on the total salinity of the water (salt concentration) and the duration of the electric current.
Consider three types of electrodes for the described experiment - steel, aluminum, copper. During electrolysis with iron electrodes, the anode immediately begins to dissolve with the formation of black-green flakes of ferrous hydroxide. This stratification is obtained in a couple of minutes of operation at a good direct current. Over time, iron hydroxide changes color from green to reddish-brown. A mixture of white-gray oxide / aluminum hydroxide is observed from the destroyed aluminum anode. Copper ions form mainly a brown precipitate, over time which also changes color to lighter.
Accordingly, the bulk of the substances obtained are the products of the destruction of the anode.
