SELECT * FROM question_mgmt as q WHERE id=3018 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=48 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 11th chemistry Equilibrium explain why pure liquids and solids can be ignored

Question:

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

Answer:

: For a pure substance (both solids and liquids),

Pure Substance  = Number of moles  /  Volume

                         = Mass/Molecular Mass / Volume

                         = Mass /  Volume x Molecular Mass

                         = Density /  Molecular Mass

Now, the molecular mass and density (at a particular temperature) of a pure substance is always fixed and is accounted for the equilibrium constant. Therefore, the values of pure substances are not mentioned in the equilibrium constant expression.


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