HCN is a weak acid, with A Ka = 4.0 x 10-10.
FN = Fe
Explanation:
Although the charge aren't the same, it should be equal to the magnitude of the forces. The coulomb force governs between both the nucleus and the electron, which is equal to the charge element.
The FN and Fe magnitudes somehow have to be equal, because the ordering does not apply in the multiplication.
There is a much more specific explanation, however, for such powers to be equivalent: they are the relationship pair of the third law of Newton, which has the same in scale and the direction opposite .
