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Le Chatelier's Principle

Investigate how changes in concentration and temperature affect chemical equilibrium
Fe³⁺(pale yellow)
Forward rate
0.01
[Fe(SCN)]²⁺(deep red)
Backward rate
0.01

Change Concentration

Temperature Control25°C

0°C80°C

HKDSE Tip

  • Opposing change:
    An equilibrium system opposes changes in concentration, temperature, or pressure.
  • AgNO₃ precipitation:
    Adding AgNO₃ precipitates SCN⁻, shifting equilibrium left.
  • Equilibrium constant:
    Only temperature change affects the equilibrium constant .