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The Quantum Mechanical Picture of The Atom20104672313

VIEWS: 3 PAGES: 9

									Factors That affect
    Solubility
        (SCH 3U)
     Mr. Montgomery
What are factors That
 affect Solubility?
           Looking at the Solute
   Solubility describes the amount of solute that
    can be dissolved in a given amount of solute
    under given conditions.




                                                     3
           Looking At the Solute
     What are factors Affecting Solubility?
   A) Molecular   Size:        B) Temperature:
    small molecules tend to Solids in Liquids:
    be more soluble that      solubility of solids↑
    larger molecules in polar with an ↑ in T.
    solvents.
   e.g.                     Gases in Liquids:
     methanol vs. pentanol    solubility of gases ↓
                              with a ↑ in T.

                                                      4
           Looking At the Solute
     What are factors Affecting Solubility?
   C) Pressure:            D) Type   of Solvent:
  only affects the           the general rule is
                             “likes dissolve likes”.
  solubility of gases in
                             This means that a polar
  liquids.                   solvent will dissolve a
 When P ↑, the solubility   polar solute, while a
  of gases↑                  non-polar solvent will
                             dissolve a non-polar
       e.g. carbon
                             solute.
  dioxide
  I      in a pop can
                                                     5
             Looking At the Solute
       What are factors Affecting Solubility?
   E) Shape of Molecule:
    the shape of the
    molecule can have a
    large influence on the
    solubility of the solute.
   e.g. #1) water
   e.g. #2) carbon dioxide


                                                6
What are Factors That
 Affect the Solvent?
           Looking At the Solvent
    Factors Affecting the rate of Dissolving
   A) Temperature:               B) Agitation:
    Increasing the                 Stirring or shaking
    temperature of the             brings fresh solvent
    solvent increases the KE       into contact with
    (kinetic energy). This         solute, which increases
    increases the # of             the # of collisions that
    collisions between the         solvent molecules have
    solvent and solute.            with solute molecules.

                                                         8
          Looking At the Solvent
    Factors Affecting the rate of Dissolving
   C) Particle Size:
    Crushing the solute into smaller pieces
    increases the surface area and therefore the
    # of molecules available to collide with
    solvent.



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