The following pictures represent solutions that contain a weak acid HA (pKa = 5.0) and its potassium salt KA.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent A- ions.(K+,H3O+ initially present,OH- initially present and solvent water molecules have been omitted for clarity. ) 
-Which picture represents the equilibrium state of the solution after addition of one H3O+ ion to the solution shown in picture (1) ?
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