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Explain why pure liquids and solids can be ignored while writing the equilibrium constant expression.

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This can be explained by considering density of pure solid or pure liquid. [Pure liquid] or [Pure solid]

= No. of moles/Volume in L

No of moles= Mass/ Mol. Mass = Mass / mol.mass/Volume 

= Mass/Volume x 1/mol.mass = Density/mol.mass

• Density of a pure liquid or pure solid is constant at constant temperature and molecular mass is also constant, therefore, their molar concentrations are constant and are ignored into the equilibrium constant. 

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