Carry out analysis and purification of water samples from different sources, including pH testing, dissolved solids and distillation. (Required practical 8; AT 2, 3, 4)

In the Potable water subtopic, this required practical objective asks students to test and purify water samples in a controlled way. Students should know how pH testing gives evidence about acidity or alkalinity, how evaporating a measured Potable water sample can show dissolved solids, and how distillation separates water from dissolved substances. A strong answer links each method to the evidence it provides, explains why different water sources may need different treatment, and uses practical observations rather than vague claims about clean water.