Where would the hydrogen ion (h+) [or the hydronium ion (h3o+)] and the hydroxide ion (oh-) come from?

The ions charge comes from the number of valence electrons. All elements excluding transition metals want to have 8 valence electrons. The first 3 groups will try to lose electrons to get to 8 where as the 5, 6, and 7 ones will try to gain electrons. Hydrogen is to small to get 8 electrons so it settles for 2 like helium because helium is a noble gas. oxygen needs 2 electrons and hydrogen gives one thats hy H is positive H3O is positive and OH is nwgitive.

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.

Just took the quiz on edgenuity and the correct answer is "c.  4.54 x  10–12  j"