- The first bottle is the control. Add no flocculant
(aluminum sulfate and lime) to this bottle. The second
bottle will have the aluminum sulfate plus lime added as
flocculant.
- To the experimental bottle, use a plastic spoon to add a
small amount of lime to the solution to make the sample
basic. Test that the solution is basic
by using pH paper. (Litmus paper should turn blue; pH
should be 10 or greater.) Now add 25 mL of the aluminum
sulfate solution. Add 25 mL water to the control bottle
to see if merely adding the water makes a difference.
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