Measuring the course of a reaction by measuring the height of a precipitate    

Lead Nitrate and Potassium Iodide

This video demonstrates the addition of differing amounts of Lead nitrate to a standard volume of Potassium iodide. The first tube has 1ml, second 2ml etc. The height of the precipitate indicates the stoichiometry of the reaction.

Right click here for a Word document with photographs and an explanation of the experiment.

Left click to view high quality video or right click to download (8.5MB)

For more information see School Chemistry Experiments - a collection of tried and tested experiments for use in schools - ASE - Ralph Farley.