Explain why pure liquids and solids can be ignored while writing the equilibrium constant expression?
✓
Answer
For pure liquid or solid : $=\frac{\text { Moles of substance }}{\text { Volume of substance }}=\frac{\text { Mass of substance }}{\text { Molar mass } \times \text { Volume }}$ $=\frac{\text { Density of substance }}{\text { Molar mass }}$ At constant temperature the density and molar mass of pure liquid and solid are constants. Hence, molar concentration will be constant and this do not depend on quantity of substance. Hence while writing equilibrium constant expression pure liquids and solids are neglected.
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