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Exam 16: Applications of Aqueous Equilibria

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Question 101

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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 water molecules have been omitted for clarity) . -Which picture represents the solution at the equivalence point?

A) (1)
B) (2)
C) (3)
D) (4)

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Question 102

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What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of NaCN? Assume that the volumes of the solutions are additive and that K_a = 4.9 × 10^-10 for HCN.

A) 4.9 × 10^-11 M
B) 4.9 × 10^-10 M
C) 4.9 × 10^-9 M
D) 7.0 × 10^-6 M

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Question 103

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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 A^2- ions.(K⁺,H₃O⁺ initially present,OH^- initially present and solvent water molecules have been omitted for clarity) . -Which picture represents the system halfway to the first equivalence point?

A buffer prepared by mixing equal moles of an acid having K_a = 4.5 × 10^-4 and a salt of its conjugate base has a pH = ________.

What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH₃CO₂H with 25.00 mL of 0.050 M CH₃CO₂Na? Assume that the volume of the solutions are additive and that K_a = 1.8 × 10^-5 for CH₃CO₂H.

Which of these neutralization reactions has a pH < 7 when equal molar amounts of acid and base are mixed?

What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.20 M HCl? K_a = 3.0 × 10^-8 for HOCl.

The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H₂A with NaOH. -Which point a-d represents the second equivalence point?

The following pictures represent solutions that contain a weak acid HA (pK_a = 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 OH^- ion to the solution shown in picture (1) ?

Identify the following solutions as acidic,basic,or inert. NaNO₂ _______ NaNO₃ ________ C₅H₅NHClO₄ ________

The following pictures represent solutions of CaCO₃,which may also contain ions other than Ca²⁺ and CO₃^2- which are not shown.Gray spheres represent Ca²⁺ ions and unshaded spheres represent CO₃^2- ions. -If solution (1) is a saturated solution of CaCO₃,which of solutions (1) -(4) represents the solution after a small amount of K₂CO₃ is added and equilibrium is restored?

The neutralization constant K_n for the neutralization of penicillin V (C₁₆H₁₈N₂O₅S)and erythromycin (C₃₇H₆₇NO₁₃)is 1.3 × 10⁶.The acid dissociation constant K_a for penicillin V is 2.0 × 10^-3.What is the base dissociation constant K_b for erythromycin?

Which of the following titrations result in an acidic solution at the equivalence point?

What is the pH of a solution made by mixing 20.00 mL of 0.100 M HCl with 40.00 mL of 0.100 M KOH? Assume that the volumes of the solutions are additive.

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 halfway between the first and second equivalence points?

What is not a correct expression for the weak acid HA?

The dissociation equilibrium constants for the protonated form of alanine (a diprotic amino acid,H₂X⁺) are K_a1 = 4.6 × 10^-3 and K_a2 = 2.0 × 10^-10.What is the pH of 50.00 mL of a 0.0500 M solution of alanine after 25.00 mL of 0.100 M NaOH has been added?

What is the hydronium ion concentration in a solution prepared by mixing 50.00 mL of 0.10 M HCN with 50.00 mL of NaCN? Assume that the volumes of the solutions are additive and that K_a = 4.9 × 10^-10 for HCN.

What is the molar solubility of AgCl in 0.10 M NaCN if the colorless complex ion Ag(CN) ₂^- forms? K_sp for AgCl is 1.8 × 10^-10 and K_f for Ag(CN) ₂^- is 1.0 × 10²¹.

The artist's pigment cadmium yellow,CdS,has a water solubility of 0.13 g/L.The solubility product of CdS,K_sp = ________.