What experimental evidence do you have for the existence of ionic bonding?

Answer 1

That the disassociated ions conduct electricity. They must be charged and oppositely charged to conduct electricity in solution and the must dissasociate to a reasonable degree to do so. Thus.

NaCl

Na + ( cation )

and

Cl - (anion )

are electrolytes conducting electricity in solution. This is a common chemistry class demonstration.

Answer 2

Experimental evidence for the existence of ionic bonding includes X-ray diffraction studies that show orderly and repeating patterns in ionic compounds, conductivity measurements that demonstrate the ability of these compounds to conduct electricity when dissolved in water, and the observation of high melting and boiling points in ionic compounds due to the strong electrostatic forces between ions.