In this example, we begin with 0.05 molar of Peruvic acid and 0.07 molar of sodium Peruvine. Our ka for our acid is 3.1 times ten to negative three. We want to find the PH of our buffer solution. Once we mix these two guys, there are two methods we can use use to find the PH of the buffer solution. Our first method involves the Henderson Hasselblack formula. And if you haven't seen this formula before or you don't know where it comes from, check out the link below.