What is the value of the equilibrium constant for the neutralization of acetic acid with sodium hydroxide? The Ka for acetic acid is 1.8 ? 10-5 and the neutralization reaction of interest is CH3CO2H(aq) + NaOH(aq) Ì H2O(l) + NaCH3CO2(aq). A) 1.8 ? 10-8 B) 1.8 ? 109 C) 5.6 ? 10-10 D) 1.8 ? 10-19