Can copper replace hydrogen in HCl?

No, copper cannot replace hydrogen in hydrochloric acid (HCl) under normal conditions. This is because copper is a less reactive metal than hydrogen, as determined by its position in the reactivity series of metals. Only metals that are more reactive than hydrogen can displace it from acids, such as zinc, magnesium, or iron. Copper, being less reactive, does not react with HCl to release hydrogen gas.