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Topic: Thermodynamics Problem  (Read 6814 times)

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Offline K.C.P

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Thermodynamics Problem
« on: February 29, 2008, 06:45:09 PM »
Consider the reaction:

ZnSO4.7H2O -----------> ZnSO4.6H2O + H2O(l)

Wouldn't it appear that the gibbs energy change for this reaction is 0? Seeing that the activity of pure substances is 1 hence the equilibrium constant K=1.
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Offline FeLiXe

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Re: Thermodynamics Problem
« Reply #1 on: March 02, 2008, 02:39:37 PM »
the equilibrium constant would depend on the water concentration
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Offline K.C.P

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Re: Thermodynamics Problem
« Reply #2 on: March 03, 2008, 02:23:17 AM »
Can you elaborate?

Thanks.
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Offline FeLiXe

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Re: Thermodynamics Problem
« Reply #3 on: March 03, 2008, 08:44:07 AM »
K=[H20]*1/1 basically so it's not 1
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Offline K.C.P

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Re: Thermodynamics Problem
« Reply #4 on: March 04, 2008, 12:34:52 AM »
So why isn't it treated as a pure substance?
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