# Does Copper reacts with Sodium Sulfate solution?

Okay I am trying to make a capacitor in which current collector is copper foil and electrolyte is sodium sulfate. Would this work? Do these two react with each other or not?

• If you can provide more information, that will help us help you get an answer to your question. You could expand on the experimental setup, for instance, and what capacitance you expect, and so on. What are the other materials in the cell? – Todd Minehardt Sep 12 '15 at 12:39
• Why, these two are perfectly indifferent to each other. Your capacitor should be fine, as long as you don't apply any voltage to it. – Ivan Neretin Sep 12 '15 at 12:54
• Ofcourse one must charge and discharge capacitor. Its like psuedocapacitor nano material is deposited on the copper plate which acts as current collector. – Shaw Sep 13 '15 at 0:37
• To expand on Ivan's answer, this would not be a good idea. I assume you mean to use a solution of sodium sulphate in water, which has neutral pH. While this is not itself corrosive to copper (copper being far less reactive than sodium) it will however corrode badly at the positive electrode due to anodic dissolution. Copper can however be used safely as a negative electrode current collector. – Simon Tillson Nov 18 '15 at 1:42

An electrolytic capacitor works because a material such as aluminum or tantalum develops a tightly-adherent insulating oxide layer when immersed in certain solutions and "formed". Copper does not have an adherent insulating oxide; instead, cuprous oxide is a semiconductor and $\ce{Cu2O}$ can be used to make a rectifier.