Question

Calculate the Coulombic force of attraction between Na+ and Cl- in a 0.35 M aqueous solution....

Calculate the Coulombic force of attraction between Na+ and Cl- in a 0.35 M aqueous solution. The elementary charge is 1.602 x 10-19 C, the dielectric constant is 78.5 and the permittivity of vacuum is 8.854 x 10-12 C2 N-1 m-2.

Will ion pairing between Na+ and Cl- occur at 310K under those conditions and why?

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Answer #1

FORMULA :

                   COULOMBIC FORCE OF ATTRACTION , F = Kq1q2 / r2

          here , K = 9*109 , q1 =q2 = 1.602*10-19

                 permitivity vacuum , r = 8.854*10-12

          F = (9*109) * (1.602*10-19 ) * (1.602*10-19 ) / 8.854*10-12

         F   = 2.61 * 10-12 J

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