Ka and Kb

Acidity
Basicity
The Conjugate Seesaw

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Tracy Tran 3L
Posts: 106
Joined: Fri Sep 24, 2021 6:15 am

Ka and Kb

Postby Tracy Tran 3L » Sat Nov 27, 2021 1:26 am

What exactly is Ka and Kb? How would I be able to find Kb if given Ka and vice versa?

Alekhya_Pantula_2E
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Re: Ka and Kb

Postby Alekhya_Pantula_2E » Sat Nov 27, 2021 1:34 am

Ka is the acid dissociation constant and Kb is the base dissociation constant. The lower Ka for the acid, it indicates that it's a weak acid that holds tightly onto the proton. The weaker the acid, the stronger the base. The stronger the base, the higher the Kb. The weaker the acid, the lower the Ka. So they move in that way.

Mona Reddy Kurra 1J
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Re: Ka and Kb

Postby Mona Reddy Kurra 1J » Sat Nov 27, 2021 11:35 pm

Hi! To add on to the previous post, Kb can be calculated from Ka and vice versa using the formula Kw = Ka * Kb. This formula also shows the inverse relationship between Ka and Kb. I hope that helps!

Anish_Marripati_2F
Posts: 104
Joined: Fri Sep 24, 2021 7:31 am

Re: Ka and Kb

Postby Anish_Marripati_2F » Sat Nov 27, 2021 11:38 pm

Ka and Kb are the acid and base dissociation constants, respectively. The higher Ka and Kb are the stronger the acid and base and the more it dissociates. You can find ka if you know kb by plugging into the kw=ka*kb equation.

Sanskriti Balaji 1J
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Re: Ka and Kb

Postby Sanskriti Balaji 1J » Sun Nov 28, 2021 1:51 am

Hi! Ka and Kb are the dissociation constants for acids and bases.The stronger the acids and bases, the higher the value is for Ka and Kb, and vice versa. You can calculate the value of Ka and Kb by using this equation and solving for the constant you need, if you know the other: Kw = Ka * Kb

Audrey Banzali-Marks 1A
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Joined: Fri Sep 24, 2021 6:32 am

Re: Ka and Kb

Postby Audrey Banzali-Marks 1A » Mon Nov 29, 2021 10:08 pm

I believe the simplest way to get Ka and Kb is to remember that for any Ka, the product of it and its corresponding Kb should equal Kw (10^-7), which is the Ka & Kb of water (neutral).

Hannah Jin 1J
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Joined: Fri Sep 24, 2021 6:42 am

Re: Ka and Kb

Postby Hannah Jin 1J » Mon Nov 29, 2021 10:31 pm

Audrey Banzali-Marks 3E wrote:I believe the simplest way to get Ka and Kb is to remember that for any Ka, the product of it and its corresponding Kb should equal Kw (10^-7), which is the Ka & Kb of water (neutral).


Do we need to know about Kb for the final?


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