textbook problem

[105747606]

Hi! Foes anyone know how to solve 6D.15 textbook problem?

[Ilan Yafeh 1K]

Hi for this problem you are given the pH and the kb value. First you must find ka and to do that you do 1 x10^-14/1.8x10^-5, which is the kb value. Now you have to do a ice table with the given initial molarity, and from the ice table you get x^2/.19-x. You have to make that equal to ka in order to solve for x, and because ka is less then 1x10^-3, you can eliminate the x from .19 -x. Once solving for x you have to get the -log of that value and that will give you pH.