The surface of an ideal molecule of table salt (NaCl) is a square with a chemica

Question

The surface of an ideal molecule of table salt (NaCl) is a square with a chemical structure as shown in the figure. The blue spheres represent Na+ ions and the green spheres represent Cl? ions. Consider only points A, B, C, and D. What is the magnitude of the net electrostatic force on the chlorine ion at point A due to the sodium ions at points B and C? Note: the bond length is 0.282 nm.
_________ N

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Explanation / Answer

Electric force due to Cl at point B in N at point A is

F = k (16) (11) e^2 / ( 0.282*10^ -9 m ) ^2

= ( 9*10^ 9 ) ( 16 ) ( 11) ( 1.6*10^ -19 C )^2 / ( 0.282*10^ -9 m ) ^2

=5.09*10^ -7 N

Since force point A due to B is along x -axis and force on point A due to C is along y-axis.

F = sqrt ( (5.09*10^-7 N)^2 + (5.09*10^-7 N ) ^2 )

=7.211*10^-7 N

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