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The concentration of a pure liquid or solid is just its density divided by its mass and if it doesn't change on either side of the equation, meaning none of it is dissolving, then there is no point in including it in the k equation.
Talia Leano 2H wrote:Why don't solids have a concentration?
Solids aren't considered to have a concentration in terms of calculating equilibrium because they cancel out on both sides of the equation, or they don't have an effect on the equilibrium state of a reaction.
Concentration is the ratio of solute to solvent meaning the amount of something in solution compared to the amount of the solution itself. This doesn't really make sense for a solid because if I just hold some salt for example, there is no solute or solvent. However, Density is a measurement similar to concentration because density is the ratio of the amount of something to the amount of space it takes up.
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