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Topic: Equilibrium Constant from Ksp / Kf / Ka  (Read 10398 times)

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Offline thisisvik

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Equilibrium Constant from Ksp / Kf / Ka
« on: August 09, 2008, 06:52:25 PM »
I could not find any method to approach this question.. it stumped me.. am I missing something simple?

Using the value of Ksp for Ag2S, the Ka1 and Ka2 for H2S, and the Kf for AgCl2-; calculate the equilibrium constant for the following reaction:

Ag2S(aq)+ 4Cl-(aq) + 2 H+(aq) <---> 2 AgCl2-(aq) + H2S(aq)

I know you can get the molar solubility for Ag2S, and that the Kf for AgCl2- is 1.1 x 105... but I have no idea how this helps me reach the equilibrium constant???

Any help is greatly appreciated..

Offline Yggdrasil

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Re: Equilibrium Constant from Ksp / Kf / Ka
« Reply #1 on: August 09, 2008, 07:14:05 PM »
First write out the chemical reactions represented by each of the equilibrium constants.

Then find a way to combine those chemical reactions to obtain the desired reaction.

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