Representations of Equilibrium

Chemical equilibrium can be represented in multiple ways, each providing insights into the reaction status and composition of the system.

Key Representations

1. Chemical Equation with Double Arrow

   • A ⇌ B indicates dynamic equilibrium, with forward and reverse reactions occurring simultaneously.

2. Concentration vs. Time Graph

   • Shows how reactant and product concentrations stabilize over time.
   • At equilibrium, concentrations remain constant.

3. Reaction Quotient (Q) vs. Equilibrium Constant (K)

   • Q = K → system at equilibrium
   • Q < K → reaction shifts forward
   • Q > K → reaction shifts reverse

4. Energy Profile Diagram

   • Illustrates reactant and product energies, activation energy, and ΔG at equilibrium.

5. ICE Table (Initial, Change, Equilibrium)

   • Provides systematic calculation of equilibrium concentrations using K.

Importance

• Helps visualize equilibrium behavior
• Supports quantitative calculations
• Facilitates understanding of Le Châtelier’s Principle and reaction manipulation

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