So the question that I want to ask right now is why is it that in a buffered system we want equal concentrations of the acetic acid and acetate ion? So why must this actually be true? Well, to answer that question, let's take a look at the following curve. So, earlier I said that the flat of the curve is the greater the ability of that buffer system to actually prevent a drastic change in PH from actually taking place. So based on the curve, where exactly is our flattest slope? So actually I've marked down the flattest slope.