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Ka and Kb

Posted: Thu Jan 23, 2020 11:56 pm
by Leslie Almaraz 4G
Ka and Kb are only assigned to weak acids and weak bases?

Re: Ka and Kb

Posted: Fri Jan 24, 2020 1:19 am
by Selena Yu 1H
Yes, Ka and Kb are only assigned to weak acids and bases because Ka and Kb are the equilibrium constants for the dissociation of acid or base in the water and if you have a value for Ka and Kb that means that the acid or base isn't fully dissociated yet and not being completely dissociated is related to weak acids and bases as strong acids and bases completely dissociate.

Re: Ka and Kb

Posted: Fri Jan 24, 2020 6:26 am
by Bryan Chen 1H
No, strong acids and bases also have Ka and Kb i think, it is just very large (and they also dissociate completely) so there's no real need to use it in problems

Re: Ka and Kb

Posted: Fri Jan 24, 2020 8:35 am
by Ryan_K_1K
yeah that's correct. Strong acids and bases also have Ka and Kb values

Re: Ka and Kb

Posted: Fri Jan 24, 2020 12:20 pm
by Ayushi2011
Strong acids and bases do have Ka and Kb.

Re: Ka and Kb

Posted: Fri Jan 24, 2020 12:33 pm
by 905373636
Bryan Chen 1H wrote:No, strong acids and bases also have Ka and Kb i think, it is just very large (and they also dissociate completely) so there's no real need to use it in problems


What, hypothetically, would be a situation that we use strong acids'/bases' Ka and/or Kb?

Re: Ka and Kb

Posted: Sun Jan 26, 2020 8:20 pm
by 205389184
No, I believe Ka and Kb values can also apply to strong acids and bases as well as weak ones.

Re: Ka and Kb

Posted: Sun Jan 26, 2020 10:12 pm
by stephaniekim2K
Yes, although I believe strong acids and bases have K values, they are so excessively big.

Re: Ka and Kb

Posted: Sun Jan 26, 2020 10:14 pm
by 105311039
Ka and Kb values can also be given to strong acids and bases they will just be excessively big I think

Re: Ka and Kb

Posted: Sun Jan 26, 2020 11:17 pm
by ABombino_2J
All acids/bases have a Ka or a Kb but strong acids and bases have such large Ka and Kb's that they are considered to fully dissociate.

Re: Ka and Kb

Posted: Mon Jan 27, 2020 11:04 am
by Sara Richmond 2K
ABombino_2J wrote:All acids/bases have a Ka or a Kb but strong acids and bases have such large Ka and Kb's that they are considered to fully dissociate.


I agree. The larger of the value of these constant would indicate strong acids/bases.