The question is what exactly is the PH of this solution? Well, to find the PH, we use equation A. So the PH is equal to the negative log of the concentration of that hydrogen ion which is ten to negative six. We plug that in and we get a PH of six. In fact, we see that anytime this is greater than this the PH of that solution will be below seven. And so if the PH of our solution is below seven at room temperature, that solution is said to be acidic.