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Our technicians use bleach to make chlorine gas when needed for school experiments, e.g. chlorine water to show displacement of the halogens. It was producing a cloudy white chlorine water - not as expected. We realised it must be because the bleach had sodium hydroxide in - so two questions1) why put that in bleach? To help it unblock drains?2) what did it make then - that made it look cloudy?It did this each time it was tried..