Equilibrium Shift

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Equilibrium Shift

Postby ConnorThomas2E » Thu Dec 07, 2017 10:03 pm

In module 4, the question asks:
The photosynthesis reaction, 6 CO2(g) + 6 H2O(l) ⇌ C6H12O6(aq) + 6 O2(g), is endothermic. What effect will the following changes have on the equilibrium composition.
a) Water is added.
b) The partial pressure of CO2 is decreased.

The answer was a) Increase [C6H12O6] and [O2], b) Decrease [O2]

I know this question has been asked on chemistry community before but I still don't understand why the liquid has an effect on the equilibrium. Don't liquids not shift the equation?

Annie Lieu-1H
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Re: Equilibrium Shift

Postby Annie Lieu-1H » Thu Dec 07, 2017 11:53 pm

Liquids don't affect the equilibrium CONSTANT because their effective concentrations stay constant throughout the reaction. BUT, In terms of shifting the reaction itself, H20 is still viewed as a reactant. If you add more H20 concentration, that's not a constant value. When you add more reactants, the equilibrium shifts right towards the product to maintain the same reactant-product concentration ratio, a requirement for equilibrium.

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Re: Equilibrium Shift

Postby DianaTrujillo2K » Fri Dec 08, 2017 12:21 am

Will there be any approximation chemical equilibrium problems on the final?

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