One litre of water contains 10-7 moles of H+ ions. Degree of ionisation of water (in percentage) is

[H+] = 10-7M = C0α                                                                               t=teq      C0 - C0α              C0α                    C0αKi (dissociation constant of water) can be expressed asConcentration of pure water at 25oC is constant and equal to 55.55 M.Ki = 1.8 ×10-16