technically, H3O+ http://www.chemguide.co.uk/physical/acidbaseeqia/kw.html Chemguide: el producto iónico del agua, Kw chemguide.co.uk/physical/acidbaseeqia/kw.html prodotto ionico dell’acqua http://www.chemguide.co.uk/physical/acidbaseeqia/kw.html prodotto ionico dell’acqua not exactly mean the water becomes more acidic