Oct 06, 2002 · Where K w is the equilibrium constant for water at 25° C (unitless) [H +] is the molar concentration of hydrogen [OH-] is the molar concentration of hydroxide. An equilibrium constant less than one (1) suggests that the reaction prefers to stay on the side of the reactants -- in this case, water likes to stay as water. Dec 21, 2020 · So \(K_{eq}\) is a very large number (much greater than 1) and the equilibrium lies far to the right-hand side of the equation, just as we had predicted. If you had just wanted to approximate an answer without bothering to look for a calculator, you could have noted that the difference in pK a values is approximately 6, so the equilibrium ...