H2O(l) + H2O(l) (double- headed arrow) H3O+(aq) + OH-(aq)  At 5.0o C, the value of Kw for the equilibrium shown above is 1.9 x 10-15 and the value of pKw is 14.73. Based on this information, which of the following is correct for pure water at this temperature. A) H3O+ = sqrt( 1.9 x 10-15 ) B) pH = -log( 1.9x 10-15)  C) 14.73 =( H3O+)(OH-) D) pOH = pH + 14.73

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