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Why is it that when solving for Q, the reaction quotient, we disregard the solids and the liquids in the chemical equation? I think we disregard solids because it isn’t possible to find the concentration of a solid but why do we disregard liquids?
Because they do not affect the concentrations of reactants and products, liquids are not taken into account for equilibrium reactions. That being said H2O undergoes a acid base reaction with itself when it produces hydrogen ions and hydroxide ions spontaneously, but it goes disregarded because water naturally stabilizes at 7 ph.
We disregard solids and liquids because their concentrations are the same throughout the reaction. Concentration equals to density divided by molar mass and both solids and liquids' densities are pretty much constant, therefore concentrations of solids and liquids are constant.
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