So the acid association curve Ka is equal to the product of the concentration of these two products divided by the concentration of that acid. So this is the acid that we're using in our buffer system, and this is its conjugate base. Now let's take the log of both sides. We get the following result. Now, let's actually use a simple rule that we know for mathematics. So in mathematics, we learn that if we take the log of the product of two values, a and B, then by the laws of logs, that is equal to log of A plus log of B.