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Plzzzzzz telll why concentration of solid and liquid takenas1

Plzzzzzz telll why concentration of solid and liquid takenas1
 
 
 
 
 

Grade:11

1 Answers

Arun
25750 Points
5 years ago
Pure solids or liquids are excluded from the equilibrium expression because their effective concentrationsstay constant throughout the reaction. The concentration of a pure liquid or solid equals its density divided by its molar mass.
 
For solids or liquids, as mass decreases the volume also decreases by a proportional amount. 1000L water and 10mL water both have molar densities of 55.5 mol/L. 
So molar density variations are minimum and hence the variations in molar activity is minimum. So the activity coefficient is taken as unity

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