Hey guys, im new here. I am a college student that is trying to brush up on some chemistry. I am reading an old textbook that I have, and I didnt understand something. I was wondering how some would use the Kb of a weak base, how they would determine the value of Ka for the conjugate base? A sample problem in the book is: A weak acid has a Kb= 1.5 x 10^-9. What is the value of Ka for the conjugate base? I have read the whole chapter over Acid & Bases, but it says this problem is on the cd-rom that is included with my book. Yet, i never recieved that cd when I bought my book. I have tried searching but have had no luck. Any help would be great. I am just trying to understand the relationship between Ka and Kb. Thanks again.