We are all aware of the fabulous work done bycharities such as Water Aid in developing countries.  But water also needs to...
Need to know (for the UK):Water sourcesPollutants in waterPurifying waterTesting water for sulphates and group 7 ions
Water resources in the UK• Use page 94 of your revision guide to:   – Find 4 places where we get our water   – Explain why...
Testing water for dissolved ions                 PrecipitatesA precipitate is a ____________ that forms whentwo dissolved ...
Testing water for dissolved ions                 PrecipitatesA precipitate is a solid that forms whentwo dissolved ions re...
Testing water for dissolved ions                     PrecipitatesSulphate ions SO42-             Group 7 (halide) ions Cl-...
Testing water for dissolved ions                     PrecipitatesSulphate ions SO42-Add acidified barium chloride         ...
Testing water for dissolved ions                     PrecipitatesSulphate ions SO42-Add acidified barium chloride         ...
Testing water for dissolved ions                     PrecipitatesSulphate ions SO42-Add acidified barium chloride         ...
Testing water for dissolved ions                             Precipitates                                           Group ...
Testing water for dissolved ions                             Precipitates                                           Group ...
Testing water for dissolved ions                             Precipitates                                           Group ...
Water sourcesPollutants in waterPurifying waterTesting water for sulphates and group 7 ions  Quick test
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Purifying and testing water

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Purifying and testing water

  1. 1. We are all aware of the fabulous work done bycharities such as Water Aid in developing countries. But water also needs to be purified in the UK
  2. 2. Need to know (for the UK):Water sourcesPollutants in waterPurifying waterTesting water for sulphates and group 7 ions
  3. 3. Water resources in the UK• Use page 94 of your revision guide to: – Find 4 places where we get our water – Explain why it is important to conserve water – List 3 impurities that can be found in tap water and explain how they get there – Describe the water purification process: • Filtration; Sedimentation; Chlorination• Ext: Explain why some soluble substances are not removed from water during purification• Ext: Explain the disadvantage of obtaining fresh water by distilling sea water
  4. 4. Testing water for dissolved ions PrecipitatesA precipitate is a ____________ that forms whentwo dissolved i_ _ _ react together Sulphate ions SO42- Group 7 (halide) ions Cl-, Br-, I-
  5. 5. Testing water for dissolved ions PrecipitatesA precipitate is a solid that forms whentwo dissolved ions react together Sulphate ions SO42- Group 7 (halide) ions Cl-, Br-, I-
  6. 6. Testing water for dissolved ions PrecipitatesSulphate ions SO42- Group 7 (halide) ions Cl-, Br-, I-Add acidified barium chloride Add acidified silver nitrate video
  7. 7. Testing water for dissolved ions PrecipitatesSulphate ions SO42-Add acidified barium chloride Barium chloride + potassium sulfate → Barium sulfate + potassium chloride White precipitate
  8. 8. Testing water for dissolved ions PrecipitatesSulphate ions SO42-Add acidified barium chloride Barium chloride + potassium sulfate → Barium sulfate + potassium chloride BaCl2 + K2SO4 → BaSO4 + 2KCl White precipitate
  9. 9. Testing water for dissolved ions PrecipitatesSulphate ions SO42-Add acidified barium chloride Barium chloride + potassium sulfate → Barium sulfate + potassium chloride BaCl2 + K2SO4 → BaSO4 + 2KCl Ba2+(aq) + SO42-(aq) → BaSO4 (s) White precipitate
  10. 10. Testing water for dissolved ions Precipitates Group 7 (halide) ions Cl-, Br-, I- Add acidified silver nitrateSilver nitrate + sodium chloride → sliver chloride + sodium nitrate Cl- Br- I- Silver chloride → white precipitate Silver bromide → cream precipitate Silver iodide → yellow precipitate video
  11. 11. Testing water for dissolved ions Precipitates Group 7 (halide) ions Cl-, Br-, I- Add acidified silver nitrateSilver nitrate + sodium chloride → sliver chloride + sodium nitrate Cl- Br- I-AgNO3 + NaCl → AgCl + NaNO3 Silver chloride → white precipitate Silver bromide → cream precipitate Silver iodide → yellow precipitate video
  12. 12. Testing water for dissolved ions Precipitates Group 7 (halide) ions Cl-, Br-, I- Add acidified silver nitrateSilver nitrate + sodium chloride → sliver chloride + sodium nitrate Cl- Br- I-AgNO3 + NaCl → AgCl + NaNO3Ag+(aq) + Cl-(aq) → AgCl(s) Silver chloride → white precipitate Silver bromide → cream precipitate Silver iodide → yellow precipitate video
  13. 13. Water sourcesPollutants in waterPurifying waterTesting water for sulphates and group 7 ions Quick test
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