> 'old' in the sense that all molecules are Trying to remember school chemistry lessons, when they explained pH, ... I think H2O is in equilibrium with H+ and

> 'old' in the sense that all molecules are Trying to remember school chemistry lessons, when they explained pH, ... I think H2O is in equilibrium with H+ and OH-, perhaps with 1 in 10^7 of the molecules being disassociated at any time (hence pH 7), so a particular H2O molecule doesn't survive for very long. Minutes? Hours? Not years, I think.