The Effect of Changing Concentration Simplified Revision Notes for GCSE AQA Chemistry Combined Science

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Learn about Reversibility & Equilibrium for your GCSE Chemistry Combined Science Exam. This Revision Note includes a summary of Reversibility & Equilibrium for easy recall in your Chemistry Combined Science exam

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6.2.5 The Effect of Changing Concentration

The concentration of reactants or products in a reaction can affect the position of equilibrium. According to Le Chatelier's Principle, if the concentration of a reactant or product is changed, the equilibrium will shift to counteract this change.

Increasing the concentration of reactants: The system will shift towards the products (right) to use up the extra reactants and produce more products.
Decreasing the concentration of reactants: The system will shift towards the reactants (left) to produce more reactants and restore balance.
Increasing the concentration of products: The equilibrium will shift towards the reactants (left) to reduce the concentration of products.
Decreasing the concentration of products: The system will shift towards the products (right) to produce more products.

lightbulbExample

Example: In the formation of ammonia:

N2​+3H2​⇌2NH3​

→ If more nitrogen or hydrogen is added, the equilibrium shifts to the right to produce more ammonia.

→ If ammonia is removed, the equilibrium also shifts to the right to produce more ammonia.

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