Relationship Between Equilibrium Constant K, Reaction Quotient Q, And Gibbs Energy G
Chapter Name : Equilibrium |
Sub Topic Code : 102_11_07_08_01 |
Topic Name : Relationship Between Equilibrium Constant K, Reaction Quotient Q, And Gibbs Energy G |
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Sub Topic Name : Relationship Between Equilibrium Constant K, Reaction Quotient Q, And Gibbs Energy G |
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Introduction
• To calculate the equilibrium concentration from the initial concentrations 5 steps are required to know the value of Kc, for a reaction does not depend on the rate of the reaction. • It is directly related to the thermodynamics of the reaction and in particular, to the change in Gibbs energy, ?G. • ?G is negative; reaction is spontaneous àproceeds in the forward direction. • ?G is positive; reaction is non- spontaneous à products converted into reactants. • ?G = 0 , reaction is in equilibrium.
Pre-Requisites:
Reaction, equilibrium constant, reaction quotient, Gibbs energy
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Reaction quotient | • The reaction quotient, Q. • (Qc with molar concentrations and Qp with partial pressures) is defined in the same way as the equilibrium constant Kc except that the concentrations in Qc are not necessarily equilibrium values. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Liquid water and water vapor in a closed container | • Heterogeneous equilibrium mixture example. |
Practical examples around us
| Examples | Explainations |
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What you learn in Theory:
• To calculate the equilibrium concentration from the initial concentrations 5 steps are required to know the value of Kc, for a reaction does not depend on the rate of the reaction. • It is directly related to the thermodynamics of the reaction and in particular, to the change in Gibbs energy, ?G. • ?G is negative; reaction is spontaneous àproceeds in the forward direction. • ?G is positive; reaction is non- spontaneous à products converted into reactants. • ?G = 0 , reaction is in equilibrium.