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Le-Chatelier Principle Cheat Sheet by

Le-Chatelier Principle discussed in the easiest way to sum up your learning.

Le-Cha­telier Principle

At the equili­brium of reversible reaction, if any of the factors (tempe­rature, pressure and concen­tra­tion) is changed, the position of the equili­brium will shift in such a direction that the effect of change of factors is relieved.

Effect of temper­ature (ex­oth­ermic reacti­on)

A+B---­>C+­D+E­nergy
Or, A+B---­>C+D; ∇H=-ve
Temper­ature increase
Temper­ature decrese
Rate of forward reaction<Rate of backward reaction
Rate of forward reaction>Rate of backward reaction
Equili­brium shift left ward
Equili­brium shift right ward
Product concen­tration decrease
Product concen­tration increase

Effect of pressure

N2+3H2--->2NH3
Total mol more on left side
Pressure increase
Pressure decrease
Rate of forward reacti­on>Rate of backward reaction
Rate of forward reacti­on<Rate of backward reaction
Equili­brium shift right ward
Equili­brium shift left ward
Product concen­tration increase
Product concen­tration decrease

Effect of pressure

PCl5--->PCl3+Cl2
Total mol more on right side
Pressure increase
Pressure decrese
Rate of forward reacti­on<Rate of backward reaction
Rate of forward reacti­on>Rate of backward reaction
Equili­brium shift left ward
Equili­brium shift right ward
Product concen­tration decrease
Product concen­tration increase
 

Effect of pressure

H2+I2-‐->2HI
Total mol equal on both side
Pressure increase
Pressure decrease
No effect
No effect

Effect of pressure

Only applicable for gasses as pressure doesn't affect solid or liquid.

Effect of concen­tration

Reacta­nt-­-->­product
Concen­tration increase
Concen­tration decrease
Rate of forward reacti­on>Rate of backward reaction
Rate of forward reacti­on<Rate of backward reaction
Equili­brium shift right ward
Equili­brium shift left ward
Product concen­tration increase
Product concen­tration decrease

Effect of temper­ature (en­dot­hermic reacti­on)

A+B---­>C+­D-E­nergy
Or, A+B---­>C+D; ∇H=+ve
Temper­ature increase
Temper­ature decrese
Rate of forward reacti­on>Rate of backward reaction
Rate of forward reacti­on<Rate of backward reaction
Equili­brium shift right ward
Equili­brium shift left ward
Product concen­tration increase
Product concen­tration decrease
           
 

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  • Published: 9th November, 2024

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