chem demonstrations

[sofiyah]

i need to perform a demonstration/experiment that relates to chemical equilibrium for my class, does anyone have any ideas?

the materials have to be found in a high school class room
the experiment should be fun and not dangerous

[Borek]

A lot depends on what reagents you can use and how well your lab is equipped.

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buffer calculator (http://www.chembuddy.com/?left=Buffer-Maker&right=buffer-calculator), concentration calculator (http://www.chembuddy.com/?left=CASC&right=concentration_and_solution_calculator)
pH calculator (http://www.chembuddy.com/?left=BATE&right=pH-calculator), stoichiometry calculator (http://www.chembuddy.com/?left=EBAS&right=equation-balancing-stoichiometry)