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During lecture professor lavelle stated that molar concentration of a pure substance (solid or liquid) does not change in a reaction. Do the concentrations of products and reactants not change during a reaction? Can someone please elaborate, also the part about liquid being a solvent and its concentration not changing was also a bit confusing.
So during a reaction, a pure substance (like water) does not have a big change in concentration. The other reactants and products that are not pure substances will have a change in concentration as the reaction is reaching an equilibrium, which is why they remain in the equation to find the equilibrium constant. A liquid (like water) is used as a solvent for a solute which would then be considered an aqueous solute. The change in concentration of the aqueous solute is considered in the equilibrium constant equation, but the solvent (in this case water) is not.
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