HCl dissociates into H+ and Cl- in solution. The H+ interacts with H2O to make H3O+. Thus, when there\'s extra acid in solution, there\'s extra H3O+ in solution. This pushes the reaction to the left. Make sense? I hope so! :) Solution HCl dissociates into H+ and Cl- in solution. The H+ interacts with H2O to make H3O+. Thus, when there\'s extra acid in solution, there\'s extra H3O+ in solution. This pushes the reaction to the left. Make sense? I hope so! :).