Question: when hcl is added to water?
Answer: If we add a strong acid or strong base to water, the pH will change dramatically. For instance, adding a strong acid such as HCl to water results in the reaction HCl + H2O → H3O+ + Cl-. In other words, the proton (H+) from the acid binds to neutral water molecules to form H3O+ raising the concentration of H+.