So remember, our equation for conjugate acid and conjugate base is conjugate acid plus our water gives us conjugate base plus our hydronium ion. So let's write the equilibrium equation for this guy. So, Ka, our acid ionization constant is equal to the concentration of hydronium times the concentration of Pyruvate divided by the concentration of pyruvic acid. Now, initially we begin with some amount of this guy and some amount of this guy, right? We don't have any of this guy. Or we approximate this guy to be zero.