Problem: The following pictures represent solutions at various points in the titration of a weak acid HA with aqueous KOH. 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 H2O molecules have been omitted for clarity). Which picture below represents the solution at the equivalence point? (a) 1 (b) 2 (c) 3 (d) 4 (e) None of the above.

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The following pictures represent solutions at various points in the titration of a weak acid HA with aqueous KOH. 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 H2O molecules have been omitted for clarity).

Which picture below represents the solution at the equivalence point?

(a) 1

(b) 2

(c) 3

(d) 4

(e) None of the above.