4) mathrm(Cu)+mathrm(H)_(2) mathrm(SO)_(4)=

The reaction between copper (Cu) and sulfuric acid (H₂SO₄) depends on the concentration of the sulfuric acid. For dilute sulfuric acid, the reaction is:<br /><br />\[ \mathrm{Cu} + \mathrm{H}_{2}\mathrm{SO}_{4} \rightarrow \mathrm{CuSO}_{4} + \mathrm{H}_{2} \]<br /><br />However, if the sulfuric acid is concentrated, the reaction can be more complex and may involve the formation of copper sulfate (CuSO₄), sulfur dioxide (SO₂), and water (H₂O):<br /><br />\[ \mathrm{Cu} + 2\mathrm{H}_{2}\mathrm{SO}_{4} \rightarrow \mathrm{CuSO}_{4} + \mathrm{SO}_{2} + 2\mathrm{H}_{2}\mathrm{O} \]<br /><br />In both cases, copper reacts with sulfuric acid to produce copper sulfate and hydrogen gas (in the case of dilute sulfuric acid) or copper sulfate, sulfur dioxide, and water (in the case of concentrated sulfuric acid).