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. So Ka is equal to the concentration of this guy times the concentration of this guy divided by the concentration of this guy. So, 3.16
times ten to the negative four times 3.16 times ten to negative four divided by 0.2968 gives me 3.36
times ten to negative six. So that's our Ka.