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The Following Pictures Represent Solutions That Contain a Weak Acid

question 45

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The following pictures represent solutions that contain a weak acid HA (pKa = 5.0) and its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent A- ions.(K+,H3O+,OH-,and solvent H2O molecules have been omitted for clarity. ) The following pictures represent solutions that contain a weak acid HA (pK<sub>a</sub> = 5.0) and its potassium salt KA.Unshaded spheres represent H atoms and shaded spheres represent A<sup>-</sup> ions.(K<sup>+</sup>,H<sub>3</sub>O<sup>+</sup>,OH<sup>-</sup>,and solvent H<sub>2</sub>O molecules have been omitted for clarity. )    -For which of these solutions is pH = pK<sub>a</sub>? A) All have pH = pK<sub>a</sub>. B) (1) , (2) and (3)  C) (1) and (4)  D) (2) and (3)
-For which of these solutions is pH = pKa?

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