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Water, pH and Macromolecules - Medical Science

Q1:

The dissociation constant of H2O at 25° C is

A 10-14 M

B 1014 M

C 10-7 M

D 107 M

ANS:A - 10-14 M

The dissociation constant is the degree of dissociation of the ions of a molecule. In this case: H+ and OH-.

The Pure water is completely ionized. therefore, has a neutral pH. pH = -log[H+]
7 = -log [H+] therefore, [H+] = 10^-7M.