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Aluminum in a solution of Copper Sulfate (II) (CuSO4) doesn't react, but adding sodium chloride (NaCl, table salt) a reaction occurs. It is a displacement and redox reaction. The aluminum is oxidized and copper reduced to metal copper. At the same time there is another reaction in which hydrogen from water is displaced so it is released in form of gas hydrogen (bubbles). Sodium chloride and copper sulfate act as catalyst.
Sodium chloride or table salt (NaCl) produces what is known as pitting, a kind of galvanic corrosion, above all in marine environment, like in sea vessels.
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