Volumetric analysis is the common method in determining the amount of hypochlorite or free chlorine in bleach. From the following website, you can find another suggestion for analysing the chlorine content of swimming pool water or bleach - using a colorimeter (Experiment 9.1). This is a good idea for students to carry out a scientific investigation on analysing chlorine content of swimming pool water or bleach using either instrumental method or quantitative method, or both.

Reference website: http://chemistry.slss.ie/ch_mandatoryexperiments.html

The experimental manual: colorimetric-experiment-on-swimming-pool-water.doc