Chemical calculations

  • Created by: emews
  • Created on: 05-11-17 10:15
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  • Chemical calculations
    • If you know the mass of a reactant and a product, you can use simple ratios to calculate reacting masses and product masses
    • You can calculate the amount of a substance (in moles) in a solution if you know the volume and concentration.
    • You can also work out the concentration of an acid reacting with an alkali or the other way round.
    • Percentage yield
      • For a given mass of reactants it's possible to calculate the maximum mass that could be made of a certain product
      • The mass is called the predicted yield.
      • The actual yield is the mass of product made when the reaction is actually carried out
      • A 100% yield means that no product has been lost, while a 0% yield means that no product has been made
      • Reasons why the percentage yield might be less than 100%
        • loss when filtering
        • loss when evaporating
        • loss when transferring liquids
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