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Applying Le Chatelier's Principle to Solids / Liquids

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animasian

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If you add (NH4)2HPO4 to "excessively moist soil," what happens?

According to the answer key, we can apply Le Chatelier's principle and the equilibrium is shifted to the product side resulting in a greater degree of ionization and a release of more OH-.

This seems intuitive, but I thought solids and liquids (like H2O) are excluded from the equilibrium constant? So why would more water have any effect on the equilibrium at all?

-Confused student
 

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