Kw is equal to hydronium times hydroxide log of base ten of Kw is equal to log of base ten of this entire guy. Using part A, we simply distribute, and we get log of kw is equal to log of this guy plus log of this guy. Now, to use part B, I need to multiply the entire statement by negative one. And now I can substitute. I bring this guy, the PH, into here, and this guy is simply poach goes here, and this guy is simply PKW. And now from Part C, I know that PKW is equal to 14.