The metal will undergo oxidation forming metal ion and releasing electron K ==============> K+ + e- HCl will dissociate into HCl =============> H+ + Cl- This H+ will get reduced to hydrogen gas by taking the electron released by the metal. H+ + e- =========> H2 (gas) Then the metal ion will combine with chloride forming metal chloride K+ + Cl- ====> Kcl The over all reaction would be K + HCl =====> Kcl + H2 [not balanced] Note: when metal react with acid, it will form metal salt releasing hydrogen gas] Solution The metal will undergo oxidation forming metal ion and releasing electron K ==============> K+ + e- HCl will dissociate into HCl =============> H+ + Cl- This H+ will get reduced to hydrogen gas by taking the electron released by the metal. H+ + e- =========> H2 (gas) Then the metal ion will combine with chloride forming metal chloride K+ + Cl- ====> Kcl The over all reaction would be K + HCl =====> Kcl + H2 [not balanced] Note: when metal react with acid, it will form metal salt releasing hydrogen gas].