A small town in a remote part of the UK needs 0.45 million m³ of potable water each year.
The table gives data for two possible water sources.
| Water source | Maximum volume available each year in million m³ | Dissolved salts in g/dm³ | Energy needed to produce 1 m³ of potable water in kWh |
|---|---|---|---|
| Rain-fed freshwater lake | 0.48 | 0.15 | 0.25 |
| Sea | 20 | 35 | 4.2 |
Evaluate which water source the town should use.
Use data from the table in your answer.
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.