Ka constant

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Ka constant

Postby Ami_Pant_4G » Sat Nov 30, 2019 10:20 am

What does the Ka equilibrium constant represent and what is it used for? Thanks in advance.

Sarah Zhari 1D
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Re: Ka constant

Postby Sarah Zhari 1D » Sat Nov 30, 2019 10:31 am

Ka is the equilibrium constant for acids. It's used to determine the level of dissociation an acid in an aqueous solution at equilibrium by finding the ratio between the products and reactants. Because of this, a higher Ka will indicate a stronger acid, as it dissociates more. Inversely, a lower pKa indicates a stronger acid.

erica thompson 4I
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Re: Ka constant

Postby erica thompson 4I » Sat Nov 30, 2019 1:50 pm

Ka is the equilibrium constant for a weak acid

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Re: Ka constant

Postby EthanPham_1G » Sat Nov 30, 2019 1:56 pm

Ka is an equilibrium constant for acids. It is equal to Ka=[A-][H+]/[AH]
(concentration of the products divided by the concentration of the reactants).

Lavelle mentioned that only weak acids would have an equilibrium constant. This is because if it were a strong acid, it would dissociate completely into its products, with none of the reactants present.

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Re: Ka constant

Postby RasikaObla_4I » Sat Nov 30, 2019 3:13 pm

The Ka equilibrium constant represents the strength of an acid in a solution based on how well it can dissociate. Lavelle mentioned that if a Ka value is given, it usually indicates that the element is a weak acid because a strong acid that dissociates completely would have a Ka of close to 1.

Claire Stoecklein 1E
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Joined: Sat Jul 20, 2019 12:15 am

Re: Ka constant

Postby Claire Stoecklein 1E » Sun Dec 01, 2019 7:13 pm

The Ka constant tells you how strong an acid is, if it is a very small number that means only part of it dissociates into hydronium.

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