A campsite treats water before supplying it to drinking-water taps.
The table shows the test results for the treated water and the campsite's maximum permitted values for water that is safe to drink.
| Measurement | Treated water | Maximum permitted value |
|---|---|---|
| Dissolved salts in mg/dm³ | 320 | 500 |
| Harmful microbes in each 100 cm³ | 2 | 5 |
A technician claims that the treated water is both potable and chemically pure.
Evaluate the technician's claim.
87 exam-style questions on AQA GCSE Chemistry 10.1 Using the Earth's resources and obtaining potable water, covering 10.1.1 Using the Earth's resources and sustainable development, 10.1.2 Potable water, 10.1.3 Waste water treatment, and 10.1.4 Alternative methods of extracting metals. Each one has a worked solution and a mark scheme showing where the marks go.