The Following Pictures Represent Solutions at Various Stages in the Titration

question 112

Multiple Choice

The following pictures represent solutions at various stages in the titration of a weak diprotic acid H₂A with aqueous KOH.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent A^2- ions.(K⁺,H₃O⁺ initially present,OH^- initially present and solvent water molecules have been omitted for clarity) .
-Which picture represents the system beyond the second equivalence point?

• A)(1)
• B)(2)
• C)(3)
• D)(4)

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