Asked by Valerie

What is the pH of a 0.50 M solution of NaNO2 if the Ka of H20x = 4.5 x 10^-4. I know that you use the Ka to find Kb and solve from there, but why?
Answered by DrBob222
Why not?
NO2^- is a base; it attracts a H^+ from water and Kb is the strength as a base.
Answered by Valerie
So you're saying that if you have the Ka of any acid and you can use the ionization constant of water to find Kb of its conjugate base?
Answered by DrBob222
I didn't say that in so many words but, yes, you can do that. Why? Because
KaKb = Kw.
If you know EITHER Ka or Kb you can calculate the other one from this relationship and Kw.
There are no AI answers yet. The ability to request AI answers is coming soon!