Chemistry AS CI 1.5 ES

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  • Created by: A.B.
  • Created on: 17-02-14 11:00
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  • ES Concentrations of Solutions CI 1.5
    • Calculations of Concentrations
      • Concentrations CAN be measured in grams per cubic decimetre (gdm-3)
        • (mass/volume)
        • BETTER to measure quantities in moles so concentration moldm-3
          • Triangle
      • BETTER to measure quantities in moles so concentration moldm-3
        • Triangle
    • Using Concentrations in Calculations
      • Titrations
        • Method of quantitatively finding the concentration of a solution by reacting a known volume of it with another solution of known concentration.
          • The end point of a reaction is often detected by the use of an indicator which changes colour.
        • 1. A fixed volume of solution (unknown concentration) is pipetted into a concical flask.
          • 2. A few drops of suitable indicator are added and the flask is placed onto a white tile.
            • 3. The solution of known concentration is added slowly from a burette, with constant swirling.
              • 4. As you approach the end-point, add the solution from the burette dropwise.
                • 5. After a rough titration, accurate titrations follow until concordant results are obtained.
        • Titration Calculations
          • Find the ratio of moles in the equation
            • Use triangle

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