What equation best represents the dissociation of water moleculesinto hydrogen ions and hydroxide ions?

Of the three common ways of repwresenting the dissociation of water

H2O↔ H+ + OH-

2H2O ↔ (H3O)+ + OH-

H20 <-> H+aq + OH-

Number 1 is worst-- free protons are not present

Number 2 is close

Number 3 is best as it represents the fact that the proton is associated with clusters of water hydrogen bonded water molecules