reversible reactions

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  • Reversible Reactions (reactions which can go both ways)
    • ? (the reversible reaction sign)
    • Concentrations of all reactants and products remain constant.
    • They can go backwards
    • They produce products
    • They might go forwards & backwards at the same time (in a container)
    • Heating the blue hydrated copper sulphate crystals causes them to lose their water of crystallisation, making them turn from blue to white – the white copper sulphate crystals are described as ‘anhydrous’ meaning ‘without water’ - It also gives off steam
      • this reaction can be reversed by simply adding water to the crystals. The crystals will become hydrated again and causes it to turn back to blue. This also causes the solid to get hot
        • CuSO4 + 5H2O à CuSO4•5H2O
          • This is a backwards reaction. it is an EXOTHERMIC reaction : energy is given out
      • CuSO4•5H2O à CuSO4 + 5H2O
        • This is a forward reaction. it is an ENDOTHERMIC reaction: you must put heat energy in
      • The overall equation for this reaction is CuSO4•5H2O  ?  CuSO4 + 5H2O
        • this reaction can be reversed by simply adding water to the crystals. The crystals will become hydrated again and causes it to turn back to blue. This also causes the solid to get hot
          • CuSO4 + 5H2O à CuSO4•5H2O
            • This is a backwards reaction. it is an EXOTHERMIC reaction : energy is given out
    • A TEST FOR WATER
      • Since white anhydrous copper sulfate turns blue when water is added, it can be used to test for water
        • ADD A FEW DROPS OF THE UNKNOWN LIQUID TO ANHYDROUS COPPER SULFATE
          • IF THE COMPOUND TURNS BLUE, THERE IS WATER IN THE LIQUID
            • IF THE LIQUID ALSO BOILS AT 100°C & FREEZES AT 0°C IT IS PURE WATER

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