<p>On the AP Chem exam, should we write titration/acid-base reactions with the hydronium ion or the hydrogen ion?</p>
<p>Just wondering cause newer textbooks are being printed with hydronium..</p>
<p>I'd say hydrogen ion but prolly both are accepted</p>
<p>I'm pretty sure they don't care, but if you had to chose, then do Hydronium.</p>
<p>The hydrogen ion will be fine, it really doesn't matter. Using the hydronium ion just adds a spectator water ion to the other side.</p>
<p>I would suggest using hydrogen ion for simplicity's sake. Honestly, the H3O is just a way of representing the water's interaction with hydrogen. In reality, since there are so many molecules in solution, there are also things like H5O2 and H9O4, but writing H+ is the simplest way of writing it.</p>
<p>well.. it doenst matter really
Hydrogen ion is H+
hydronium is H3O +
..
i'd stick with hydrogen, but .. doesnt matter :)</p>