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The Following Pictures Represent Solutions at Various Stages in the Titration

question 198

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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 A2- ions.(K+,H3O+ initially present,OH- initially present and solvent water molecules have been omitted for clarity) . The following pictures represent solutions at various stages in the titration of a weak diprotic acid H<sub>2</sub>A with aqueous KOH.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent A<sup>2-</sup> ions.(K<sup>+</sup>,H<sub>3</sub>O<sup>+</sup> initially present,OH<sup>-</sup> initially present and solvent water molecules have been omitted for clarity) .   -Which picture represents the system halfway between the first and second equivalence points? A) (1)  B) (2)  C) (3)  D) (4)
-Which picture represents the system halfway between the first and second equivalence points?

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