ruchi yadav
Last Activity: 10 Years ago
and the equilibrium constant is, [H+] [OH-]
K = -----------
[H2O]
For pure water, [H2O] is a constant (1000/18 = 55.6 M), and we often use theion product,Kw, for water,
Kw=K[H2O] [H+] [OH-]The constantKwdepends on temperature. At 298 K,Kw= 1x10-14. If there is no solute in water, the solution has equal concentrations of [H+] and [OH-].
[H+] = [OH-] = 1x10-7,andpH = - log [H+]= 7.Note that only at 298 K is the pH of water = 7. At higher temperatures, pH is slightly less than 7, and at lower temperature, the pH is greater than 7.
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Ruchi
Askiitians Faculty