Limiting Reactant Demo No Calculations

By reacting magnesium metal with hydrochloric acid in the presence of a little acid/base indicator, we can see a qualitative (visual) demonstration of how a chemical reaction might look in a situation that involves a limiting reactant and excess reactant.

Try viewing this one in x1.5 speed. It'll go even faster :D

The video in the link at the end shows how to use stoichiometry calculations to determine the limiting and excess reactant without having to do all the work of making chemicals and setting up an experiment.