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The concentration of a pure solid or liq...

The concentration of a pure solid or liquid phase is not include in the expression of equilibrium constant because :

A

density of solid and liquid are independent of their quantities .

B

solids and liquids react slowly.

C

solids and liquids at equilibrium do not interact with gaseous phase.

D

the molecules of solids and liquids cannot migrate to the gaseous phose.

Text Solution

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The correct Answer is:
To solve the question regarding why the concentration of pure solids or liquids is not included in the expression of the equilibrium constant, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Equilibrium Constant**: The equilibrium constant (K) for a reaction is expressed in terms of the concentrations of the reactants and products at equilibrium. It is given by the formula: \[ K_c = \frac{[\text{Products}]^{\text{coefficients}}}{[\text{Reactants}]^{\text{coefficients}}} \] 2. **Identifying Phases in a Reaction**: In a chemical reaction, we can have reactants and products in different phases: gases, liquids, and solids. For example, consider the reaction: \[ \text{CaCO}_3(s) \rightleftharpoons \text{CaO}(s) + \text{CO}_2(g) \] Here, calcium carbonate (CaCO3) and calcium oxide (CaO) are solids, while carbon dioxide (CO2) is a gas. 3. **Recognizing the Role of Solids and Liquids**: The concentrations of pure solids and pure liquids do not change during the reaction because their density is constant regardless of the amount present. This means that their "concentration" remains constant. 4. **Excluding Solids and Liquids from Kc**: Since the concentrations of pure solids and liquids do not change, they do not affect the position of equilibrium. Therefore, they are not included in the equilibrium constant expression. In our example, the equilibrium constant expression simplifies to: \[ K_c = [\text{CO}_2] \] The solids (CaCO3 and CaO) are omitted from this expression. 5. **Conclusion**: The reason why the concentration of pure solids and liquids is not included in the expression of the equilibrium constant is that their density is independent of their quantities, leading to constant concentrations that do not influence the equilibrium. ### Final Answer: The concentration of pure solids and liquids is not included in the expression of the equilibrium constant because the density of solids and liquids is independent of their quantities, leading to constant concentrations.
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