Solution Formation Worksheet - Answer Key

 

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  1. What are the three steps to solution formation

    When a solution is made there are 3 specific steps that must occur in order for the solute to dissolve into the solvent.

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    1. Expanding the Solute
      (i.e. breaking up the solute)

      This means that if you have NaCl going into water.  The first step would be separating the Na+  from the Cl-

      2.  

    2. Expanding the Solvent
      (i.e. overcoming intermolecular forces in the solvent)

      This means that the water (that the NaCl was dumped into) has to break up some of its H-bonds (etc.) to make room for the Na+ and Cl- ions.

      3.  

    3. Solution Formation
      (i.e. formation of intermolecular forces between solvent and solute)

      The solute and the solvent come together.

     

     

  2. Which steps typically require energy?

    Expanding the solute and expanding the solvent typically requires energy.  The solution’s formation typically gives off energy.

    3.  

     

  3. What is and how do you determine

      4.  

    1.  Enthalpy of Hydration 

      This the sum of the enthalpies of expanding the solvent and forming the of the solution.

      2.  

    2. Enthalpy of Solution

      This is the sum of enthalpies for each of the three steps in the process.

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