Ka and Kb

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Leslie Almaraz 4G
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Joined: Fri Aug 02, 2019 12:16 am

Ka and Kb

Postby Leslie Almaraz 4G » Thu Jan 23, 2020 11:56 pm

Ka and Kb are only assigned to weak acids and weak bases?

Selena Yu 1H
Posts: 108
Joined: Fri Aug 09, 2019 12:16 am

Re: Ka and Kb

Postby Selena Yu 1H » Fri Jan 24, 2020 1:19 am

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.

Bryan Chen 1H
Posts: 58
Joined: Mon Jun 17, 2019 7:24 am

Re: Ka and Kb

Postby Bryan Chen 1H » Fri Jan 24, 2020 6:26 am

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

Ryan_K_1K
Posts: 51
Joined: Wed Nov 14, 2018 12:18 am

Re: Ka and Kb

Postby Ryan_K_1K » Fri Jan 24, 2020 8:35 am

yeah that's correct. Strong acids and bases also have Ka and Kb values

Ayushi2011
Posts: 101
Joined: Wed Feb 27, 2019 12:17 am

Re: Ka and Kb

Postby Ayushi2011 » Fri Jan 24, 2020 12:20 pm

Strong acids and bases do have Ka and Kb.

905373636
Posts: 62
Joined: Thu Aug 01, 2019 12:15 am

Re: Ka and Kb

Postby 905373636 » Fri Jan 24, 2020 12:33 pm

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?

205389184
Posts: 100
Joined: Sat Sep 07, 2019 12:18 am

Re: Ka and Kb

Postby 205389184 » Sun Jan 26, 2020 8:20 pm

No, I believe Ka and Kb values can also apply to strong acids and bases as well as weak ones.

stephaniekim2K
Posts: 79
Joined: Fri Aug 09, 2019 12:16 am

Re: Ka and Kb

Postby stephaniekim2K » Sun Jan 26, 2020 10:12 pm

Yes, although I believe strong acids and bases have K values, they are so excessively big.

105311039
Posts: 107
Joined: Fri Aug 02, 2019 12:16 am

Re: Ka and Kb

Postby 105311039 » Sun Jan 26, 2020 10:14 pm

Ka and Kb values can also be given to strong acids and bases they will just be excessively big I think

ABombino_2J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

Re: Ka and Kb

Postby ABombino_2J » Sun Jan 26, 2020 11:17 pm

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.

Sara Richmond 2K
Posts: 110
Joined: Fri Aug 30, 2019 12:16 am

Re: Ka and Kb

Postby Sara Richmond 2K » Mon Jan 27, 2020 11:04 am

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.


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