Why can not each metal react to its own salt Eg. Cu and CuSO4 ?

Answer: Metals do not typically react with their salts because the formation of a metal salt involves the transfer of electrons from the metal atoms to non-metal atoms or groups (anions), resulting in the creation of a stable ionic compound.

Let’s take the example of copper (Cu) and copper sulfate (CuSO4) to explain why this reaction does not occur:

1. Ionic Bond Formation: Copper sulfate (CuSO4) is an ionic compound consisting of positively charged copper ions (Cu²⁺) and negatively charged sulfate ions (SO₄²⁻). The formation of this compound involves the transfer of electrons from copper to sulfur and oxygen atoms, resulting in the formation of these ions.
2. Stability: The resulting ions (Cu²⁺ and SO₄²⁻) are stable due to the complete transfer of electrons. Copper atoms in metallic form already have a stable electron configuration in their outermost energy level, making them reluctant to lose or gain electrons further.
3. Energy Considerations: It requires energy to break the existing bonds in metallic copper and copper ions. This energy is often greater than the energy released when new bonds are formed in the reaction, making the reaction unfavorable and non-spontaneous.

As a result, metals like copper do not react with their salts, as the energy considerations and electron configurations make such reactions thermodynamically unfavorable. Instead, metals tend to react with non-metallic elements or compounds to achieve a more stable and energetically favorable state