Well, the initial amount of vitonic acid minus final amount of conjugate base. So this guy in molar minus this guy in molar will give me the amount of vitamin acid left over. So 0.3 the amount I began with minus 3.116 times ten to negative four. This guy gives me how much of my vitonic acid is left over at equilibrium or 0.2968 molar. So now I have all my equilibrium concentrations. So I simply write my equilibrium expression.