H₂O(l) + H₂O(l) = H₃0+ (aq) + OH(aq)
At 5.0°C, the value of K, for the equilibrium shown above is 1.9 x 10⁻¹⁵ and the value of pK, is 14.73. Based on this information, which of the following is correct for pure water at this temperature?

(A) (H30+1= √1.9 x 10-15 X 10⁻¹⁵
(B) pH = -log(1.9 x 10⁻¹⁵)
(C) 14.73 = [H₃O+]ₑᵩ [OH)ₑᵩ
(D) pOH = pH + 14.73