I have recently learned how to balance chemical equations using the ion electron method. However, I have some doubts.. Suppose the reaction takes place in an acidic medium; now how can we say that we are allowed to add an H+ or H2O molecule? I mean, where will these elements come from when these reactions take place in real life? from the environment or is this just a method of simplifying the equations and these added elements do not play a role when these reactions take place in real life? Please help me out here..