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I'm not completely certain about this but I'm convinced that an anode actually loses mass.

For example, in the cell equations for an Ag(s) cathode being dipped into an AgNO3 solution, connected to a Cu(s) anode being dipped into a Cu(NO3)2 solition,

2Ag+(aq) + 2e- -> 2Ag(s) (Cathode 1/2 reaction, reduction)

Cu(s) -> Cu2+(aq) +2e- (Anode 1/2 reaction, oxidation)

, the cathode reaction is taking the Ag+(aq) ions in the AgNO3- solution and turning them into solid silver, Ag(s). Therefore, I believe it is correct to assume that solid silver is being formed in the cathode solution.

The anode half reaction however is the opposite, taking a solid copper atom, Cu(s), and turning it into an aqueous copper cation, Cu2+(aq). This leads me to believe that the copper rod (anode) is losing mass.

So, I believe the cathode is gaining mass and the anode is losing mass.

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14y ago

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