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Like the others have said, changes in pressure that affect volume only applies to gases since changes in pressure don't have an impact/affect liquids or solids, so aqueous species would also be unaffected since they're not gases, but rather a chemical species that has been dissolved in water. A question that shows this as an example is 5.61 in the textbook. Hope this helps!
Increasing pressure (by decreasing volume) only applies to gases because for liquids and solids, changing the pressure does not change the volume. Therefore, you would only consider the moles of gases.
It only applies to gasses so don't worry about in another context. Also, it follows the least moles. One of the crazier ideas is if the moles are the same is that there is no direct change rather it just decrease equally.
Gases because they are the only ones that have partial pressures. Aqueous, liquids, and solids do not have partial pressures so increasing the system's pressure won't do anything to them or their concentrations.
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