So, in step one and three, I find that PKA. And step two, I find the hydroxide filtration. So let's skip to step two. Now, the first thing I do is I use the formula PH plus poh equals 14. Now, if you're not certain about this formula and you don't know where this formula comes from, check out the link below. So, I simply take our PH, plug it in into this number, and we get 14 equals 3.5 plus poh subtract by 3.5
and I get poh is equal to 10.5.