C4h - Purifying and Testing Water 4.0 / 5 based on 2 ratings ? ChemistryWater hardness and solubilityGCSEOCR Created by: EsmeCreated on: 21-11-12 18:56 What are the four main sources of water in the UK? Rivers, lakes, reservoirs, aquifers. 1 of 15 What does the chemical industry use water as? A coolant, solvent, raw material. 2 of 15 Why is it important to conserve water? The demand is higher than the supply in some parts of Britain. 3 of 15 What can raw water contain? Insoluble particles, pollutants, microorganisms, dissolved salts and minerals. 4 of 15 What must be done to water to make it pure? Distillation. 5 of 15 What's the problem with distillation? The equipment and energy is expensive. 6 of 15 What do pollutants include? Nitrates, lead compounds, pesticides. 7 of 15 Where are nitrates from? Fertilisers. 8 of 15 What are lead compounds from? Pipes in plumbing. 9 of 15 What are pesticides from? Spraying crops. 10 of 15 How can sulfates be detected? Reacting with barium chloride solution to form a white precipitate of barium sulfate. 11 of 15 What is silver nitrate solution used for? Detecting halide ions. 12 of 15 What coloured precipitate do silver nitrate and chlorides form? White. 13 of 15 What coloured precipitate do silver nitrate and bromides form? Cream. 14 of 15 What coloured precipitate do silver nitrate and iodides form? Yellow. 15 of 15
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