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Copper does not react with water because the oxygen in water is locked into a compound with two parts hydrogen, one part oxygen. Oxygen by it's self, reacts with copper to patina the copper. The patina shields the copper from corrosion, unlike iron, which oxygen oxides iron and causes rust, which is a type of corrosion.

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13y ago
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14y ago

because above 400 degree celsius copper copper reacts with sulphur and turns into cupric sulphate which forms a thin layer in the vessel ..... so copper cannot be used in preparing hydrogen ...

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13y ago

With water this is not possible (in the way potassium and sodium can), because H2O is not a strong oxydiser, Cu2+ is stronger.

Copper gives only hydrogen when reacting with nitric acid because that acid (H+) is strong enough (Cu2+ is weaker than that):

Cu + 2 HNO3 --> Cu2+ + 2 NO3- + H2

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Q: Why doesn't copper react with water?
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