Now normally in chemistry instead of using ka to basically describe the strength of that acid, we use something else called the PKA. And the relation between PKA and Ka is given by this equation. So PKA is equal to the negative log of the ka. So from this relation we see that the greater the ka value is, the smaller the PKA is. And likewise the smaller the K is, the greater the PKA is. So we see that the greater the Ka is, the smaller the PKA is.