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Homework Help: Determine if a bond is more ionic or covalent

  1. Dec 2, 2012 #1
    1. The problem statement, all variables and given/known data
    What has more ionic character NaF or NaCl?Covalent?

    2. Relevant equations
    Measured Dipole moment of NaF 27.2e^-30
    Measured dipole moment of NaCl 30e^-30
    Dipole moment=qd
    Fractional ionic character=measured dipole moment/qd
    Equilibrium separation of NaCl =.236nm
    Equilibrium separation of NaF=.193nm
    3. The attempt at a solution
    What I did is this factional ionic character of NaF is 27.2e^-30/((1.6e^-19)(.193e^-9))= 88% and NaCl is 30e^-30/((1.6e^-19)(.236e^-9))= 79% so what I would take from this is that NaCl is more ionic because of the lower percentage and NaF is more covalent due to a a fractional ionic of 88%. However this is confusing me because I would think based on electro negativity difference NaF would be ionic because higher at 3.05 vs 2.23. Which is right? Also which has more ionic character?
    Last edited: Dec 2, 2012
  2. jcsd
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