Chemistry 2

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  • Water
    • Hard Water
      • Contains dissolved magnesium and calcium.
        • Temporary Hard Water.
          • Hardness can be removed.
        • Permanent hard water.
          • Hardness CAN NOT be removed.
      • Testing For Hard Water.
        • 1.Add soap solution.         2.when shaken if not  a lot of lather forms it means you have ard water.
      • Softening Hard Water.
        • 1. Boil to remove hardness as fur/ lime scale.
        • 2. Add sodium chloride (washing soda)
        • 3. Pass water through in  exchange.
      • Advantages
        • 1. Tastes better.
          • 2. Lowers risk of heart disease.
            • 3. Strengthens bones and teeth.
      • Disadvantages.
        • 1.Clods/ damages water pipes.
          • 2.Uses  more soap/ detergent.
      • Water Treatment.
        • Water comes lakes/ rivers  which means it need to be treated for safe domestic use.s fro  rivers
        • 1. Sedimentation.
          • Large particles settle.
        • 2. Filteration.
          • Passed through filters to remove small particles.
        • 3. Chlorination.
          • Untitled
    • Solubility.
      • Amount od solute(solid) which will dissolve in 100g of water.
        • In a graph you should see that the solubility usually increases with the temperature
    • Desliation
      • 1. Used to remove salt from sea water.
      • 2. Uses a lot of energy.
      • 3. Expensive process.
    • Uses Of Water.
      • 1. Drinking.
      • 2. Growing food.
      • 3.Industrial produce.
      • 4.Wahing.

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