Prentice Hall
© 2003
LOHS
AP Chem Schrempp 2008
46
Effect of
Temperature Changes
•Consider
for which DH > 0.
–Co(H2O)62+ is pale pink and CoCl42- is blue.
–If a light purple room
temperature equilibrium mixture is placed in a beaker of warm water, the mixture turns deep
blue.
–Since DH > 0
(endothermic), adding heat favors the forward reaction, i.e. the formation of blue CoCl42-.
Le Châtelier’s Principle
