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Demonstrations › Equilibria

Lecture Demonstrations


Test tubes containing a pink solution of cobalt and chloride ions are placed in hot water and cold water. The tube placed in hot water will turn blue. The tube placed in cold water will turn more pink.


Changes in the concentrations of the reactants and products cause a shift in equilibrium in the yellow chromate-orange dichromate system.


Magnesium is placed in cold and hot water. The magnesium will not visibly react with the cold water, but will in hot water, producing magnesium hydroxide. The formation of the hydroxide can be illustrated using universal indicator.


When the flask containing a clear solution of sodium bicarbonate is evacuated, CO2 gas is evolved and the solution turns pink.


A precipitate of silver chloride is dissolved upon addition of a clear liquid. Adding a second clear liquid produces a precipitate again.