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Topic: need help with acid-base and Keq  (Read 5202 times)

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sungirl322

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need help with acid-base and Keq
« on: September 12, 2004, 09:19:36 PM »
 ???, I am not sure how to determine the Keq of an acid base reaction. I thought it was the ka of the products/ the ka of the reactants. Please help
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Offline Donaldson Tan

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Re:need help with acid-base and Keq
« Reply #1 on: September 13, 2004, 02:01:11 AM »
HX + H2O <-> H3O+ + X-

Ka = [ H3O+ ] [ X- ] / [ HA ]

The Ka term excludes the [H2O] in the denominator as [H2O] is fairly a constant in an aqueous system.

Just include [H2O] in the denominator to convert Ka to Keq

Keq = [ H3O+ ] [ X- ] / [ HA ] [H2O]
« Last Edit: September 13, 2004, 02:03:48 AM by geodome »
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