Chemical reactions take time. Of course, some are much more rapid than others, but none are instantaneous. Equilibrium requires equal reaction rates, and therefore it will take some time for a reaction to reach equilibrium. During that time, the concentration of both reactants and products will change.
| Click on this icon if you want to do a simulation experiment to measure this change. | |
| Click on this icon if you want to use a sample set of data, instead of actually measuring the results. | |