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==Key Stage 4==
===Meaning===
Analysis and [[Pure|purification]] of [[water]] from different sources.
===Method===
A sample of rain water, sea water and bottled 'spring' water should be supplied.
====Testing the pH====
#Using a clean [[pipettespipette]] s to add 2ml of a [[water]] [[sample]] to a [[Test Tube|test tube]] and label it.
#Add 2 drops of [[pH Indicator]] to the [[Test Tube|test tube]] and record the [[colour]] and [[pH]].
#Repeat steps 1 and 2 for each [[water]] [[sample]].