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Topic: Calculating delta G given the dissociation of a weak acid?  (Read 9707 times)

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Offline gt101

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Calculating delta G given the dissociation of a weak acid?
« on: November 07, 2009, 01:38:14 AM »
The problem is that I am given the dissociation of a weak acid HA with a Ka value of 4.5x10^-7 in water. Thus, the equation would look like HA⇔[H+]+A-. I am asked to calculate delta G (in kJ) for this reaction at 25 degrees celcius.
I know I should use this equation, deltaG=-RTlnK
I do not understand what K would equal?
Thank you.
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Offline Schrödinger

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Re: Calculating delta G given the dissociation of a weak acid?
« Reply #1 on: November 07, 2009, 02:41:33 AM »
K is the equilibrium constant for the reaction under consideration.
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